CN102408718A - Silicon foaming adhesive composition and its preparation method, silicon foaming adhesive and ultrasonic sensor - Google Patents
Silicon foaming adhesive composition and its preparation method, silicon foaming adhesive and ultrasonic sensor Download PDFInfo
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- CN102408718A CN102408718A CN2010102914536A CN201010291453A CN102408718A CN 102408718 A CN102408718 A CN 102408718A CN 2010102914536 A CN2010102914536 A CN 2010102914536A CN 201010291453 A CN201010291453 A CN 201010291453A CN 102408718 A CN102408718 A CN 102408718A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 103
- 239000010703 silicon Substances 0.000 title claims abstract description 103
- 239000000203 mixture Substances 0.000 title claims abstract description 25
- 238000005187 foaming Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000853 adhesive Substances 0.000 title abstract 11
- 230000001070 adhesive effect Effects 0.000 title abstract 11
- 239000007822 coupling agent Substances 0.000 claims abstract description 19
- 229920002050 silicone resin Polymers 0.000 claims abstract description 15
- 239000003292 glue Substances 0.000 claims description 96
- 238000013016 damping Methods 0.000 claims description 19
- 239000011863 silicon-based powder Substances 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 13
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 229920002545 silicone oil Polymers 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 10
- 239000002250 absorbent Substances 0.000 claims description 9
- 230000002745 absorbent Effects 0.000 claims description 9
- 229940037003 alum Drugs 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 3
- JZCCFEFSEZPSOG-UHFFFAOYSA-L copper(II) sulfate pentahydrate Chemical compound O.O.O.O.O.[Cu+2].[O-]S([O-])(=O)=O JZCCFEFSEZPSOG-UHFFFAOYSA-L 0.000 claims description 3
- 229910052602 gypsum Inorganic materials 0.000 claims description 3
- 239000010440 gypsum Substances 0.000 claims description 3
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- JZZIHCLFHIXETF-UHFFFAOYSA-N dimethylsilicon Chemical compound C[Si]C JZZIHCLFHIXETF-UHFFFAOYSA-N 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 239000004205 dimethyl polysiloxane Substances 0.000 abstract 2
- 235000013870 dimethyl polysiloxane Nutrition 0.000 abstract 2
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 abstract 2
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 abstract 1
- 229940008099 dimethicone Drugs 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- -1 polydimethylsiloxane Polymers 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000004073 vulcanization Methods 0.000 description 4
- 239000004604 Blowing Agent Substances 0.000 description 3
- 206010000269 abscess Diseases 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 150000003376 silicon Chemical class 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005987 sulfurization reaction Methods 0.000 description 2
- 238000001149 thermolysis Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 241000197194 Bulla Species 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 208000002352 blister Diseases 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 125000001434 methanylylidene group Chemical group [H]C#[*] 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 125000005375 organosiloxane group Chemical group 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920000260 silastic Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention provides a silicon foaming adhesive composition, by taking the total mass of the silicon foaming adhesive composition as a reference, the silicon foaming adhesive composition has the following ingredients: 50-75% of polydimethylsiloxane, 15-40% of dimethicone, 5-20% of silica micropowder, 0.5-2% of silicone resin, 1-10% of coupling agent, 0.5-3% of 4,4'-oxydibenzenesulfonyl hydrazide, 0.5-3% of crystalline hydrate. The invention also provides a preparation method of the silicon foaming adhesive composition, a silicon foaming adhesive prepared by the silicon foaming adhesive composition and an ultrasonic sensor containing the silicon foaming adhesive. The silicon foaming adhesive has large porosity and uniform aperture distribution, the ultrasonic sensor by using the silicon foaming adhesive has the advantages of small aftershock and low impedance.
Description
Technical field
The present invention relates to a kind of silicon foamed glue composition and method of making the same, a kind of silicon foamed glue and a kind of ultrasonic transducer.
Background technology
In ultrasonic transducer, because the vibration of piezoelectric element, the shell bottom surface produces vibration, the radiation ultrasonic signal, run into obstacle after, by this obstacle reflection, be back in the same ultrasonic transducer, thereby be used to detect obstacle.Generally speaking, in ultrasonic transducer shell when vibration,, enclosure also can produce ultrasonic signal, causes the internal leakage vibrational energy, and shell can produce the high order vibration of looking genuine, even piezoelectric element no longer vibrates, shell vibrates and still can continue, and is referred to as reverberation.If the reverberation time length is longer, the ultrasonic signal that piezoelectric element produces because of reverberation can disturb even flood the ultrasonic signal by the obstacle reflection, makes that the UW or the detection data that can't detect by the obstacle reflection are wrong.
For lowering reverberation, generally, for example can adopt silicon foamed glue material in the prior art with vesicular structure at the inner ultrasonic signal that uses sound-absorbing material to absorb enclosure of ultrasonic transducer.Silicon foamed glue material is generally processed through single-component room temperature vulcanized Zylox is carried out chemicalfoaming, and self cure is mainly vulcanized by absorbing airborne moisture, and Zylox does not foam basically at this moment, and perhaps frothing percentage is very low; During heating, vulcanization rate changes little, and expansion rate increases greatly, makes vulcanization rate and expansion rate be difficult to control.If it is not enough that the too fast meeting of overcuring causes Zylox to work the rate of sending out, produce bulla, demixing phenomenon; The too fast meeting of expansion rate causes the rubber item aperture excessive, and easy generation is subsided, and product surface plays pit, poor flexibility.Adopt the aftershock and the impedance of ultrasonic transducer of this silicon foamed glue material bigger.
A kind of preparation method of foamed glue is disclosed in the prior art; Wherein whipping agent adopts blowing agent H (N; N '-dinitrobenzene five methyne tetramines) and sodium hydrogencarbonate, frothing aid adopts alum, and wherein alum can effectively reduce the heat decomposition temperature of blowing agent H; Quicken the thermolysis of whipping agent, make whipping agent fully overflow gas.In this method, though alum can improve expansion rate, vulcanization rate is still lower, is difficult to and expansion rate coupling, makes that the porosity of the foamed glue that obtains through this method is lower, and the aperture is inhomogeneous.
Summary of the invention
The invention solves that silicon foamed glue porosity is low in the prior art, the aperture is inhomogeneous, cause adopting the ultrasonic transducer aftershock and the bigger technical problem of impedance of this silicon foamed glue.
The invention provides a kind of silicon foamed glue compsn, is benchmark with the total mass of silicon foamed glue compsn, contains following component in the said silicon foamed glue compsn:
YSR 3286 50-75%;
Dimethyl silicone oil 15-40%;
Silicon powder 5-20%;
Silicone resin 0.5-2%;
Coupling agent 1-10%;
4,4 '-OBSH 0.5-3%;
Crystalline hydrate 0.5-3%.
The invention provides said silicon foamed glue preparation of compositions method; Comprise earlier 4; 4 '-OBSH (OBSH) mixes with crystalline hydrate and obtains foaming mixture; Then YSR 3286, dimethyl silicone oil, silicone resin, silicon powder, coupling agent and foaming mixture are mixed, can obtain said silicon foamed glue compsn.
The present invention also provides a kind of silicon foamed glue, and said silicon foamed glue was obtained by silicon foamed glue compsn provided by the invention in 130-150 ℃ of following heating under vacuum 20-40 minute.
The present invention provides a kind of ultrasonic transducer at last; Comprise housing and the damping metal pedestal that is tightly connected with this shell nozzle; Piezoelectric ceramic piece fixedly is equipped with in said housing bottom surface; Between piezoelectric ceramic piece and damping metal pedestal, be filled with the damping sound absorbent material, said piezoelectric ceramic piece is connected to signal transmission line; Said damping sound absorbent material is a silicon foamed glue provided by the invention.
Contriver of the present invention is through a large amount of experiments; The kind of various components and content are in the framework of the present definition in the reasonable adjusting silicon foamed glue compsn; When adopting silicon foamed glue preparation of compositions foamed glue of the present invention; Under vacuum, carry out, the required moisture of silicon foamed glue sulfuration is all provided the porosity and the controllable aperture of the silicon foamed glue that therefore obtains by the crystalline hydrate in the silicon foamed glue compsn.Can find out from the test result of embodiment; The porosity that adopts the silicon foamed glue of silicon foamed glue preparation of compositions of the present invention is 30-50%; Mean pore size is 0.2-2.0mm, and the ultrasonic transducer aftershock of adopting silicon foamed glue of the present invention to prepare is lower than 1.50ms, impedance is lower than 1500 Ω.
Embodiment
The invention provides a kind of silicon foamed glue compsn, is benchmark with the total mass of silicon foamed glue compsn, contains following component in the said silicon foamed glue compsn:
YSR 3286 50-75%;
Dimethyl silicone oil 15-40%;
Silicon powder 5-20%;
Silicone resin 0.5-2%;
Coupling agent 1-10%;
OBSH 0.5-3%；
Crystalline hydrate 0.5-3%.
Under the preferable case, be benchmark with the total mass of silicon foamed glue compsn, said silicon foamed glue compsn contains following component:
YSR 3286 55-70%;
Dimethyl silicone oil 20-35%;
Silicon powder 5-15%;
Silicone resin 0.5-1.5%;
Coupling agent 1-5%;
OBSH 0.5-1.5%；
Crystalline hydrate 0.5-1.5%.
In the silicon foamed glue compsn of the present invention, adopt crystalline hydrate as frothing aid.Crystalline hydrate can be taken off the water molecules that contains in the molecule under heating state, for the sulfuration of silicon foamed glue provides required moisture.Therefore, among the present invention,, can further control the porosity and the pore size distribution of the silicon foamed glue that obtains through the content of crystalline hydrate in the control silicon foamed glue compsn.Among the present invention, said crystalline hydrate can be and well known to a person skilled in the art various crystalline hydrates, for example can be alum, blue stone, green vitriol, gypsum or saltcake.Under the preferable case, the mass ratio of OBSH and crystalline hydrate is 1:0.5-3.
Among the present invention, said YSR 3286 is for well known to a person skilled in the art various YSR 3286s.Under the preferable case, in order to control the viscosity of silicon foamed glue composition system, the number-average molecular weight of said YSR 3286 is 1000-8000.
Said dimethyl silicone oil is used to strengthen the mechanical property of silicon foamed glue.Under the preferable case, in order to control the viscosity of silicon foamed glue composition system, said dimethyl-silicon oil viscosity is 1-20cps.Among the present invention, said silicon foamed glue compsn is the main body with YSR 3286 and dimethyl silicone oil, is easy to control the viscosity of silicon foamed glue, thereby strengthens the flowability of silicon foamed glue.
Said silicon powder particle diameter is less, and specific surface area is big, is used to improve the intensity of silicon foamed glue.In order to improve the homogeneity of silicon foamed glue compsn, under the preferable case, the median size of said silicon powder is 0.2-5um.
The various organo-siloxanes polymers that said silicone resin is used always for those skilled in the art with cross-linked structure, 1153 silicone resin that for example can directly adopt the four seas, Guangzhou chemical industry ltd to produce.
Said coupling agent is conventionally known to one of skill in the art, for example can adopt silane coupling agent, titanate coupling agent and/or aluminate coupling agent.Among the present invention, said coupling agent can directly adopt and be purchased product, the KH550 that for example directly adopts city difficult to understand, Nanjing chemical industry ltd to produce.
The invention provides a kind of preparation method of said silicon foamed glue compsn; Comprise earlier OBSH being mixed with crystalline hydrate and obtain foaming mixture; Then YSR 3286, dimethyl silicone oil, silicone resin, silicon powder, coupling agent and foaming mixture are mixed, can obtain said silicon foamed glue compsn.
For improving the dispersing uniformity of crystalline hydrate and OBSH, can OBSH and crystalline hydrate be ground to form powdery.OBSH and crystalline hydrate blended time are 2-10 minute, and YSR 3286, dimethyl silicone oil, silicone resin, silicon powder, coupling agent and foaming mixture blended time are 10-30 minute.
The present invention also provides a kind of silicon foamed glue, and said silicon foamed glue was obtained by silicon foamed glue compsn provided by the invention in 130-150 ℃ of following heating under vacuum 20-40 minute.
Among the present invention, the preparation process of silicon foamed glue is carried out under vacuum, vulcanize required moisture and dewatered under heating condition by the crystalline hydrate in the silicon foamed glue compsn fully and provide, so sulfurized speed and degree is all controlled; In addition, crystalline hydrate can also promote the thermolysis of whipping agent OBSH, and expansion rate is also had controllability.Contriver of the present invention finds through a large amount of experiments, the content of crystalline hydrate within the scope of the invention time the in the silicon foamed glue compsn, and vulcanization rate and expansion rate coupling obtain the silicon foamed glue of the suitable and even aperture distribution of voidage.Particularly, the porosity of said silicon foamed glue is 30-50%, and mean pore size is 0.2-2.0mm.
The present invention provides a kind of ultrasonic transducer at last; Comprise housing and the damping metal pedestal that is tightly connected with this shell nozzle; Piezoelectric ceramic piece fixedly is equipped with in said housing bottom surface; Between piezoelectric ceramic piece and damping metal pedestal, be filled with the damping sound absorbent material, said piezoelectric ceramic piece is connected to signal transmission line; Said damping sound absorbent material is a silicon foamed glue provided by the invention.
Among the present invention, the structure and material of the housing of said ultrasonic transducer, damping metal pedestal and piezoelectric ceramic piece is conventionally known to one of skill in the art, does not give unnecessary details here.Said damping metal pedestal is provided with through hole, is filled with insulating material in the through hole, and signal transmission line passes said insulating material and leads to the outside.Among the present invention, the damping sound absorbent material of said ultrasonic transducer adopts silicon foamed glue provided by the invention, can effectively weaken the reverberation of ultrasonic transducer, reduces aftershock, thereby improves the measuring accuracy of ultrasonic transducer.
The thickness of said damping sound absorbent material is not less than 0.4mm, and the thickness of damping metal pedestal is not less than 0.4mm.
Below silicon foamed glue composition and method of making the same of the present invention, silicon foamed glue and ultrasonic transducer are done explanation further through embodiment.The raw material that is adopted in embodiment and the Comparative Examples all is available commercially.
Embodiment 1
(1) proportioning of each component (weight part) is by shown in the table 1: earlier OBSH and alum are added in the mortar by proportioning successively, uniform mixing obtained foaming mixture in 6 minutes; By proportioning YSR 3286 (molecular weight is 5000), dimethyl silicone oil (viscosity is 10cps), silicone resin (1153 silicone resin), silicon powder (median size is 2um), coupling agent (KH550) are added mixing drum then; Stir adding bubble mixture down, add continued and stirred 20 minutes; Obtain the silicon foamed glue compsn of present embodiment, be designated as Z1.
(2) Z1 is inserted ultrasonic transducer piezoelectric ceramic piece top, change in the vacuum drying oven and heated 30 minutes under 140 ℃, obtain containing the ultrasonic transducer S1 of silicon foamed glue J1.
Embodiment 2-5
Adopt and carry out with embodiment 1 identical step, difference is:
In the step (1), silicon foamed glue composite formula (weight part) is as shown in table 1 below:
Table 1
| Component (weight part) | Z1 | Z2 | Z3 | Z4 | Z5 |
| YSR 3286 | 62 | 55 | 70 | 50 | 75 |
| Dimethyl silicone oil | 24 | 35 | 20 | 23 | 15 |
| Silicon powder | 7 | 5 | 5 | 20 | 6 |
| Silicone resin | 1 | 1.5 | 1 | 2 | 0.5 |
| Coupling agent | 3 | 1 | 3 | 1 | 2.5 |
| OBSH | 1.5 | 1.5 | 0.5 | 1 | 0.5 |
| Crystalline hydrate | Alum, 1.5 | Blue stone, 1 | Green vitriol, 0.5 | Gypsum, 3 | Saltcake, 0.5 |
Through above-mentioned steps, contained the ultrasonic transducer S2-S5 of silicon foamed glue J2-J5 respectively.
Embodiment 6
Adopt and carry out with embodiment 1 identical step, difference is:
In the step (3), Heating temperature is 130 ℃, and be 40 minutes heat-up time;
Through above-mentioned steps, obtain containing the ultrasonic transducer S6 of silicon foamed glue J6.
Comparative Examples 1
Adopt and carry out with embodiment 1 identical step, difference is:
In the step (1), substitute the whipping agent OBSH of 1.5 weight parts with the sodium hydrogencarbonate of the blowing agent H of 0.5 weight part and 1 weight part; Obtain the silicon foamed glue compsn of this Comparative Examples, be designated as DZ1;
In the step (2), Z1 is inserted ultrasonic transducer piezoelectric ceramic piece top, 140 ℃ were heated 30 minutes down in the air, obtained containing the ultrasonic transducer DS1 of silicon foamed glue DJ1.
Comparative Examples 2
Adopt the ultrasonic transducer for preparing this Comparative Examples with Comparative Examples 1 identical method, difference is:
In the step (1), do not contain alum among the foamed glue compsn DZ2; DZ2 is inserted ultrasonic transducer piezoelectric ceramic piece top, change in the vacuum drying oven and heated 30 minutes under 140 ℃, obtain containing the ultrasonic transducer DS2 of silicon foamed glue DJ2.
Performance test:
1, the porosity of silicon foamed glue and aperture test:
Porosity test: measure the density d t of the silicon foamed glue that obtains after preceding density d 0 of foamed silastic foaming and the foaming, adopt following formula to calculate the porosity (%) of each silicon foamed glue sample J1-J6 and DJ1-DJ2:
Porosity (%)=
Mean pore size test: silicon foamed glue sample J1-J6 cut into slices with DJ1-DJ2 to be placed on the emission-type microscope stage, moves horizontally sample, surveyors' staff the maximum horizontal diameter d of each abscess of process
iEach sample is measured 50 abscesses successively.Adopt formula to calculate the mean pore size
of silicon foamed glue sample:
Test result is as shown in table 2.
2, ultrasonic transducer aftershock test:
Adopt the aftershock of simulation test circuit (Audi prestige Electronics Co., Ltd.) test ultrasonic transducer S1-S6 and DS1-DS3, test result is as shown in table 2.
3, ultrasonic transducer testing impedance:
Adopt the impedance of electric impedance analyzer (Beijing Lianbang Time Electronic Science and Technology Co.ltd) test ultrasonic transducer S1-S6 and DS1-DS3, test result is as shown in table 2.
Table 2
| Sample | Porosity (%) | Mean pore size (mm) | Sample | Aftershock (ms) | Impedance (Ω) |
| J1 | 48% | 0.8 | S1 | 1.3 | 1000 |
| J2 | 42% | 1.2 | S2 | 1.42 | 1215 |
| J3 | 35% | 2.0 | S3 | 1.50 | 1450 |
| J4 | 32% | 1.8 | S4 | 1.48 | 1485 |
| J5 | 37% | 1.7 | S5 | 1.45 | 1360 |
| J6 | 40% | 1.3 | S6 | 1.35 | 1150 |
| DJ1 | 25% | 2.1 | DS1 | 1.68 | 2150 |
| DJ2 | 30% | 1.8 | DS2 | 1.60 | 2180 |
Can find out from the test result of last table 2; The test result of S1-S6 obviously is superior to DS1-DS3; Explanation has preferable performance by the silicon foamed glue of silicon foamed glue preparation of compositions provided by the invention; Make to adopt the ultrasonic transducer of the present invention of this silicon foamed glue, aftershock is all less with impedance, thus the sensitivity of raising ultrasonic transducer.
Claims (12)
1. silicon foamed glue compsn is a benchmark with the total mass of silicon foamed glue compsn, contains following component in the said silicon foamed glue compsn:
YSR 3286 50-75%;
Dimethyl silicone oil 15-40%;
Silicon powder 5-20%;
Silicone resin 0.5-2%;
Coupling agent 1-10%;
4,4 '-OBSH 0.5-3%;
Crystalline hydrate 0.5-3%.
2. silicon foamed glue compsn according to claim 1 is characterized in that, is benchmark with the total mass of silicon foamed glue compsn, and said silicon foamed glue compsn contains following component:
YSR 3286 55-70%;
Dimethyl silicone oil 20-35%;
Silicon powder 5-15%;
Silicone resin 0.5-1.5%;
Coupling agent 1-5%;
4,4 '-OBSH 0.5-1.5%;
Crystalline hydrate 0.5-1.5%.
3. silicon foamed glue compsn according to claim 1 and 2 is characterized in that crystalline hydrate is alum, blue stone, green vitriol, gypsum or saltcake.
4. silicon foamed glue compsn according to claim 1 and 2 is characterized in that, 4,4 '-OBSH and crystalline hydrate mass ratio are 1:0.5-3.
5. silicon foamed glue compsn according to claim 1 and 2 is characterized in that said dimethyl-silicon oil viscosity is 1-20cps.
6. silicon foamed glue compsn according to claim 1 and 2 is characterized in that the median size of said silicon powder is 0.2-5um.
7. silicon foamed glue compsn according to claim 1 and 2 is characterized in that said coupling agent is one or more in silane coupling agent, titanate coupling agent and the aluminate coupling agent.
8. the described silicon foamed glue of claim 1 preparation of compositions method; Comprise earlier 4; 4 '-OBSH mixes with crystalline hydrate and obtains foaming mixture; Then YSR 3286, dimethyl silicone oil, silicone resin, silicon powder, coupling agent and foaming mixture are mixed, can obtain said silicon foamed glue compsn.
9. silicon foamed glue, said silicon foamed glue was obtained by the described silicon foamed glue of claim 1 compsn in 130-150 ℃ of following heating under vacuum 20-40 minute.
10. silicon foamed glue according to claim 9 is characterized in that, the porosity of said silicon foamed glue is 30-50%, and mean pore size is 0.2-2.0mm.
11. ultrasonic transducer; Comprise housing and the damping metal pedestal that is tightly connected with this shell nozzle; Piezoelectric ceramic piece fixedly is equipped with in said housing bottom surface, between piezoelectric ceramic piece and damping metal pedestal, is filled with the damping sound absorbent material, and said piezoelectric ceramic piece is connected to signal transmission line; It is characterized in that said damping sound absorbent material is the described silicon foamed glue of claim 9.
12. ultrasonic transducer according to claim 11 is characterized in that, the thickness of said damping sound absorbent material is not less than 0.4mm, and the thickness of damping metal pedestal is not less than 0.4mm.
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Cited By (3)
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| CN103265814A (en) * | 2013-05-23 | 2013-08-28 | 张恩天 | Polycondensation type single-component silicon rubber capable of being vulcanized at room temperature and under heating condition, and preparation method thereof |
| CN103691127A (en) * | 2013-12-25 | 2014-04-02 | 北方工业大学 | Discus height measurement device based on ultrasonic sensor |
| CN104194711A (en) * | 2014-08-15 | 2014-12-10 | 安徽省元琛环保科技有限公司 | Heat-resistant organic silicone adhesive and preparation method thereof |
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2010
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| CN103265814A (en) * | 2013-05-23 | 2013-08-28 | 张恩天 | Polycondensation type single-component silicon rubber capable of being vulcanized at room temperature and under heating condition, and preparation method thereof |
| CN103265814B (en) * | 2013-05-23 | 2015-07-01 | 厦门市金泰祥新科技有限公司 | Polycondensation type single-component silicon rubber capable of being vulcanized at room temperature and under heating condition, and preparation method thereof |
| CN103691127A (en) * | 2013-12-25 | 2014-04-02 | 北方工业大学 | Discus height measurement device based on ultrasonic sensor |
| CN103691127B (en) * | 2013-12-25 | 2016-06-22 | 北方工业大学 | A kind of discus height measuring device based on ultrasonic sensor |
| CN104194711A (en) * | 2014-08-15 | 2014-12-10 | 安徽省元琛环保科技有限公司 | Heat-resistant organic silicone adhesive and preparation method thereof |
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| CN102408718B (en) | 2013-06-19 |
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