CN102867557B - A kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance - Google Patents
A kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance Download PDFInfo
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Abstract
A kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance, it relates to the preparation method of a kind of tygon space radiation protection compound substance, the present invention is for solving the existing tygon for space radiation protective materials, its poor heat stability, and under equal in quality thickness, fine aluminium filters the inefficient technical matters of proton, preparation method of the present invention is: first add in container by ethanol and boron nitride, add coupling agent again, react in thermostatted water, obtain modification boron nitride, finally tygon and modification boron nitride are joined in high mixer, obtain boron nitride-polyethylenespace space radiation protection compound substance, the thermal degradation temperature of a kind of boron nitride-composite polyethylene material prepared by the present invention is 430 ~ 520 DEG C, thermal stability is good, and the efficiency of filtering medium improves 0.4 ~ 1 times nearly compared with fine aluminium, excellent combination property, spacecraft radiation protection has wide practical use.
Description
Technical field
The present invention relates to the preparation method of a kind of tygon space radiation protection compound substance.
Technical background
Terrestrial space is the main activities region of various manned spaceship, applied satellite, space station.Region memory is in a large amount of high energy charged particles of being caught by terrestrial magnetic field, energy reaches tens keV to hundreds of more than MeV, serious threat is caused to spacecraft in-orbit, along with the develop rapidly of China's space industry, the research of space radiation protective materials is had to the meaning become more and more important.The Space Stn. Program of following China, it is the important means that China enters world powers's ranks, cosmonaut in space station needs the long period at job space, thus the radiation protection performance how effectively improving spacecraft has long-range strategic importance, through development for many years, traditional radiation protection material is based on aluminium.In order to reach radiation-proof effect, must increase the thickness of aluminium protective layer, thus the weight of spacecraft is increased, spacecraft lightweight problem is the hot issue that designers pay close attention to always.Research shows, light element is more more effective than heavy element in opposing radiation damage, that is radiation protection efficiency along with the reduction of atomic number be increase trend.Therefore in theory, the material of low atomic number is adopted to be conducive to strengthening spacecraft capability of resistance to radiation, improve the stability of spacecraft, extend the life-span in-orbit of spacecraft simultaneously, in theory, liquid hydrogen has best protection efficiency, but infeasible during practical application, can using the hydrogen content of material as the standard weighing material protection efficiency.
Containing carbon atom, two hydrogen atoms in polyethylene molecule, there is very high hydrogen richness, there is higher radiation protection efficiency.Therefore, have broad application prospects in spacecraft radiation protection.But, in space environment, when tygon is used as radiation protection material, there will be serious " gassing phenomenon " and thermal stability is poor, strongly limit tygon as radiation protection material in spaceborne use.
Summary of the invention
The present invention is for solving the existing tygon for space radiation protective materials, its poor heat stability, and under equal in quality thickness, fine aluminium filters the inefficient technical matters of proton, and provides a kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance.
A kind of boron nitride-polyethylenespace space radiation protection compound substance of the present invention by massfraction be the polyvinyl resin of 50 ~ 95%, the coupling agent of 0 ~ 15% and 2 ~ 35% nm-class boron nitride form.
The preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance of the present invention carries out according to the following steps:
One, be 50 ~ 95%, 0 ~ 15% and 2 ~ 35% take polyvinyl resin, coupling agent and boron nitride respectively by the massfraction of polyvinyl resin, coupling agent and boron nitride;
Two, be that 1 ~ 8:1 takes ethanol by the mass ratio of the boron nitride of ethanol and step one, and the boron nitride of itself and step one together joined in high speed disperser, dispersion 1 ~ 12h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 50 ~ 120 DEG C in temperature, stirs 1 ~ 15h, suction filtration, dries, obtains modification boron nitride;
Four, the modification boron nitride that polyvinyl resin step one taken and step 3 obtain joins in high mixer, first mix 5 ~ 60min, then go in pressing machine, it is 175 ~ 240 DEG C in temperature, pressure is under the condition of 5 ~ 45MPa, compacting 1 ~ 15h, obtains boron nitride-polyethylenespace space radiation protection compound substance.
Beneficial effect of the present invention:
The present invention is using polyvinyl resin as vector resin, and add conventional functional aid and boron nitride, a kind of boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability index is greatly improved, the thermal degradation temperature of common polythene is generally 310 ~ 390 DEG C, and the thermal degradation temperature of a kind of boron nitride-composite polyethylene material prepared by the present invention is 430 ~ 520 DEG C, its thermal stability is good, in addition traditional radiation protection material fine aluminium, meet the requirement of spacecraft to material thermal stability, but the efficiency of fine aluminium filtration proton is low under equal in quality thickness, in order to reach radiation-proof effect, the thickness of aluminium protective layer must be increased, thus the weight of spacecraft is increased, a kind of boron nitride-polyethylenespace space radiation protection compound substance prepared by the present invention, not only there is good thermal stability, and under equal in quality thickness, the efficiency of filtering proton also improves 0.4 ~ 1 times nearly compared with fine aluminium, excellent combination property, and there is light weight, good dispersion, fluidity of molten is good, excellent and the normal temperature of processing characteristics and the excellent feature of low-temperature impact resistance, spacecraft radiation protection has wide practical use.
Accompanying drawing explanation
Fig. 1 is the thermal stability curve map of embodiment 1;
Fig. 2 is the thermal stability curve map of embodiment 2;
Fig. 3 is the thermal stability curve map of embodiment 3;
Fig. 4 is the thermal stability curve map of embodiment 4;
Wherein in Fig. 1 ~ 4---be respectively boron nitride-polyethylenespace space radiation protection compound substance prepared by embodiment 1 ~ 4,---be tygon;
Fig. 5 is the proton protection efficiency curve map of embodiment 1;
Fig. 6 is the proton protection efficiency curve map of embodiment 2;
Fig. 7 is the proton protection efficiency curve map of embodiment 3;
Fig. 8 is the proton protection efficiency curve map of embodiment 4;
Wherein in Fig. 5 ~ 8---be respectively boron nitride-polyethylenespace space radiation protection compound substance prepared by embodiment 1 ~ 4,---be fine aluminium.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the combination in any between each embodiment.
Embodiment one: a kind of boron nitride-polyethylenespace space radiation protection compound substance of present embodiment by massfraction be the polyvinyl resin of 50 ~ 95%, the coupling agent of 0 ~ 15% and 2 ~ 35% nm-class boron nitride form.
Embodiment two: the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance of present embodiment carries out according to the following steps:
One, be 50 ~ 95%, 0 ~ 15% and 2 ~ 35% take polyvinyl resin, coupling agent and boron nitride respectively by the massfraction of polyvinyl resin, coupling agent and boron nitride;
Two, be that 1 ~ 8:1 takes ethanol by the mass ratio of the boron nitride of ethanol and step one, and the boron nitride of itself and step one together joined in high speed disperser, dispersion 1 ~ 12h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 50 ~ 120 DEG C in temperature, stirs 1 ~ 15h, suction filtration, dries, obtains modification boron nitride;
Four, the modification boron nitride that polyvinyl resin step one taken and step 3 obtain joins in high mixer, first mix 5 ~ 60min, then go in pressing machine, it is 175 ~ 240 DEG C in temperature, pressure is under the condition of 5 ~ 45MPa, compacting 1 ~ 15h, obtains boron nitride-polyethylenespace space radiation protection compound substance.
This embodiment is using polyvinyl resin as vector resin, and add conventional functional aid and boron nitride, the boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability index is greatly improved, the thermal degradation temperature of common polythene is generally 310 ~ 390 DEG C, and the thermal degradation temperature of a kind of boron nitride-composite polyethylene material prepared by the present invention is 430 ~ 520 DEG C, its thermal stability is good, in addition traditional radiation protection material fine aluminium, meet the requirement of spacecraft to material thermal stability, but the efficiency of fine aluminium filtration proton is low under equal in quality thickness, in order to reach radiation-proof effect, the thickness of aluminium protective layer must be increased, thus the weight of spacecraft is increased, a kind of boron nitride-polyethylenespace space radiation protection compound substance prepared by the present invention, not only there is good thermal stability, and under equal in quality thickness, the efficiency of filtering proton also improves 0.4 ~ 1 times nearly compared with fine aluminium, excellent combination property, and there is light weight, good dispersion, fluidity of molten is good, excellent and the normal temperature of processing characteristics and the excellent feature of low-temperature impact resistance, spacecraft radiation protection has wide practical use.
Embodiment three: present embodiment and embodiment two unlike: the polyvinyl resin in step one be in Low Density Polyethylene, high density polyethylene, polyvinyl resin with super-high molecular weight one or more with arbitrarily than mix, other step and parameter identical with embodiment two.
Embodiment four: present embodiment and embodiment two or three unlike: the coupling agent described in step one is silane coupling agent, a kind of in titanate coupling agent, aluminate coupling agent, metal composite coupling agent, phosphate coupling agent, boric acid ester coupler or or several with arbitrarily than mix, other step and parameter identical with embodiment two or three.
Embodiment five: present embodiment and one of embodiment two to four unlike: the boron nitride of step one is a micron boron nitride, a kind of in nm-class boron nitride, two-dimensional nano boron nitride individual layer or or several with arbitrarily than mix, other step and parameter identical with one of embodiment two or four.
Embodiment six: one of present embodiment and embodiment two to five unlike: the boron nitride particle diameter of step one is 0.001 ~ 1 μm, other step and parameter identical with one of embodiment two or five.
Embodiment seven: one of present embodiment and embodiment two to six unlike: in step 2, the mass ratio of the boron nitride of ethanol and step one is 2 ~ 4:1, other step and parameter identical with one of embodiment two or six.
Embodiment eight: one of present embodiment and embodiment two to seven unlike: in step 2, the mass ratio of the boron nitride of ethanol and step one is 3:1, other step and parameter identical with one of embodiment two or seven.
Embodiment nine: one of present embodiment and embodiment two to eight unlike: in step 3, bath temperature is 80 ~ 90 DEG C, other step and parameter identical with one of embodiment two or eight.
Embodiment ten: one of present embodiment and embodiment two to nine unlike: in step 3, bath temperature is 85 DEG C, other step and parameter identical with one of embodiment two or nine.
Embodiment 11: one of present embodiment and embodiment two to ten unlike: in step 4, the high-speed mixer and mixing time is 15 ~ 30min, in pressing machine, press temperature is 180 ~ 190 DEG C, pressure is 15 ~ 25MPa, other step and parameter identical with one of embodiment two or ten.
Embodiment 12: one of present embodiment and embodiment two to ten one unlike: in step 4, the high-speed mixer and mixing time is 25min, in pressing machine, press temperature is 185 DEG C, and pressure is 20MPa, other step and parameter and embodiment two or one of 11 identical.
With following verification experimental verification beneficial effect of the present invention:
Embodiment 1: a kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance carries out according to the following steps:
One, be 94%, 1% and 5% take ldpe resin, titanate coupling agent and nm-class boron nitride respectively by the massfraction of ldpe resin, titanate coupling agent and nm-class boron nitride;
Two, be that 3:1 takes ethanol by the mass ratio of the nm-class boron nitride of ethanol and step one, and the nm-class boron nitride of itself and step one together joined in high speed disperser, dispersion 10h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the titanate coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 90 DEG C in temperature, stirs 10h, suction filtration, dries, obtains modified Nano boron nitride;
Four, the modified Nano boron nitride that ldpe resin step one taken and step 3 obtain joins in high mixer, first mix 20min, then go in pressing machine, it is 180 DEG C in temperature, pressure is under the condition of 20MPa, compacting 10h, obtains boron nitride-polyethylenespace space radiation protection compound substance;
Wherein ldpe resin density is 0.92g/cm
2, melting index is 2g/10min, and nm-class boron nitride particle diameter is 50nm.
The present embodiment is using ldpe resin as vector resin, and add titanate coupling agent two-dimensional nano boron nitride individual layer, the boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability is good, excellent to the shield structure ability of proton, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection is widely used.
Embodiment 2: a kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance carries out according to the following steps:
One, be 80%, 2% and 18% take ldpe resin, titanate coupling agent and two-dimensional nano boron nitride individual layer respectively by the massfraction of ldpe resin, titanate coupling agent and two-dimensional nano boron nitride individual layer;
Two, be that 4:1 takes ethanol by the mass ratio of the two-dimensional nano boron nitride individual layer of ethanol and step one, and the two-dimensional nano boron nitride individual layer of itself and step one together joined in high speed disperser, dispersion 10h;
Three, the potpourri of step 2 is transferred in beaker, and in beaker, add the titanate coupling agent that step one takes, then beaker is placed in water bath with thermostatic control, be under the condition of 80 DEG C in temperature, stir 10h, suction filtration, dry, obtain modification two-dimensional nano boron nitride individual layer;
Four, the modification two-dimensional nano boron nitride individual layer that ldpe resin step one taken and step 3 obtain joins in high mixer, first mix 25min, then go in pressing machine, it is 185 DEG C in temperature, pressure is under the condition of 20MPa, compacting 10h, obtains boron nitride-polyethylenespace space radiation protection compound substance;
Wherein ldpe resin density is 0.92g/cm
2, melting index is 2g/10min, and two-dimensional nano boron nitride individual layer particle diameter is 45nm.
The present embodiment is using ldpe resin as vector resin, and add titanate coupling agent two-dimensional nano boron nitride individual layer, the boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability is good, excellent to the shield structure ability of proton, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection is widely used.
Embodiment 3: a kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance carries out according to the following steps:
One, be 80%, 2%, 10% and 8% take ldpe resin, titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride respectively by the massfraction of ldpe resin, titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride;
Two, by ethanol and the two-dimensional nano boron nitride individual layer of step one and the quality of nm-class boron nitride and ratio be that 4:1 takes ethanol, and the two-dimensional nano boron nitride individual layer of itself and step one and nm-class boron nitride together to be joined in high speed disperser, dispersion 8h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the titanate coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 85 DEG C in temperature, stirs 8h, suction filtration, dries, obtains modified Nano boron nitride;
Four, the modified Nano boron nitride that ldpe resin step one taken and step 3 obtain joins in high mixer, first mix 30min, then go in pressing machine, it is 190 DEG C in temperature, pressure is under the condition of 25MPa, compacting 8h, obtains boron nitride-polyethylenespace space radiation protection compound substance;
Wherein ldpe resin density is 0.92g/cm
2, melting index is 2g/10min, and the mean grain size of two-dimensional nano boron nitride individual layer and nm-class boron nitride is 50nm.
The present embodiment is using ldpe resin as vector resin, and add titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride, the boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability is good, excellent to the shield structure ability of proton, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection is widely used.
The preparation method of embodiment 4, a kind of boron nitride-polyethylenespace space radiation protection compound substance carries out according to the following steps:
One, be 80%, 2%, 10% and 8% take ldpe resin, titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride respectively by the massfraction of high-density polyethylene resin, titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride;
Two, by ethanol and the two-dimensional nano boron nitride individual layer of step one and the quality of nm-class boron nitride and ratio be that 2:1 takes ethanol, and the two-dimensional nano boron nitride individual layer of itself and step one and nm-class boron nitride together to be joined in high speed disperser, dispersion 12h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the titanate coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 90 DEG C in temperature, stirs 12h, suction filtration, dries, obtains modified Nano boron nitride;
Four, the modified Nano boron nitride that high-density polyethylene resin step one taken and step 3 obtain joins in high mixer, first mix 20min, then go in pressing machine, it is 180 DEG C in temperature, pressure is under the condition of 20MPa, compacting 12h, obtains boron nitride-polyethylenespace space radiation protection compound substance.
Wherein high-density polyethylene resin density is 0.96g/cm
2, melting index is 5g/10min, and the mean grain size of two-dimensional nano boron nitride individual layer and nm-class boron nitride is 50nm.
The present embodiment is using high-density polyethylene resin as vector resin, and add titanate coupling agent, two-dimensional nano boron nitride individual layer and nm-class boron nitride, the boron nitride-polyethylenespace space radiation protection compound substance obtained, thermal stability is good, excellent to the shield structure ability of proton, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection is widely used.
Test one, respectively to embodiment 1 ~ 4 prepare boron nitride-polyethylenespace space radiation protection compound substance and tygon carry out thermal stability contrast test, test process carries out according to the following steps:
Boron nitride-polyethylenespace space radiation protection compound substance prepared by the embodiment 1 ~ 4 respectively quality being 10mg and quality are 10mg tygon, be placed in thermogravimetric/differential thermal analyzer, in a nitrogen atmosphere, with the speed that heating rate is 10 DEG C/min, being warming up to temperature is 800 DEG C, carry out the test of thermal stability, gather the boron nitride-polyethylenespace space radiation protection compound substance of embodiment 1 ~ 4 preparation and poly real-time quality, draw real-time quality and initial mass than variation with temperature curve, namely embodiment 1 ~ 4 prepare boron nitride-composite polyethylene material and poly thermal stability curve comparison design sketch, as shown in figures 1-4, wherein thermogravimetric/differential thermal analyzer is the Diamond TG/DTA thermogravimetric/differential thermal analyzer of PerkinElmer company of the U.S.,
As can be seen from Fig. 1 ~ 4, the temperature of tygon generation thermal degradation is 388 DEG C, and the temperature of boron nitride-composite polyethylene material generation thermal degradation prepared by embodiment 1 ~ 4 is followed successively by 446 DEG C, 463 DEG C, 442 DEG C and 438 DEG C, thermal stability index is greatly improved, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection has wide practical use.
Test two, the boron nitride-polyethylenespace space radiation protection compound substance prepared embodiment 1 ~ 4 and fine aluminium carry out the test of proton protection efficiency, and test process carries out according to the following steps:
Between the proton source that boron nitride-polyethylenespace space radiation protection compound substance embodiment 1 ~ 4 prepared respectively and fine aluminium are placed in EN-18 swindletron and energy-probe, incident proton energy immobilizes, use energy-probe collect proton through embodiment 1 ~ 4 prepare boron nitride-polyethylenespace space radiation protection compound substance and fine aluminium after dump energy, the difference of projectile energy and dump energy is the energy that material absorbs, ratio material being absorbed energy and projectile energy is as the protection efficiency of material to proton, the proton protection efficiency test comparison result of boron nitride-composite polyethylene material prepared by embodiment 1 ~ 4 and fine aluminium as shown in figures 5-8,
As can be seen from Fig. 5 ~ 8, compared with fine aluminium, under equal in quality thickness, boron nitride-composite polyethylene material prepared by embodiment 1 ~ 4, its efficiency of filtering proton improves about 0.55,0.63,0.47 and 0.42 times successively, proton barrier propterty is excellent, and there is light weight, good dispersion, fluidity of molten is good, processing characteristics is excellent and normal temperature and the excellent feature of low-temperature impact resistance, spacecraft radiation protection has wide practical use.
Claims (6)
1. a preparation method for boron nitride-polyethylenespace space radiation protection compound substance, is characterized in that this preparation method carries out according to the following steps:
One, be 50 ~ 95%, 0 ~ 15% and 2 ~ 35% take polyvinyl resin, coupling agent and boron nitride respectively by the massfraction of polyvinyl resin, coupling agent and boron nitride;
Boron nitride described in step one be in nm-class boron nitride and two-dimensional nano boron nitride individual layer one or both with arbitrarily than mixing;
Two, be that 1 ~ 8:1 takes ethanol by the mass ratio of the boron nitride of ethanol and step one, and the boron nitride of itself and step one together joined in high speed disperser, dispersion 1 ~ 12h;
Three, transferred in beaker by the potpourri of step 2, and in beaker, add the coupling agent that step one takes, then beaker being placed in water bath with thermostatic control, is under the condition of 50 ~ 120 DEG C in temperature, stirs 1 ~ 15h, suction filtration, dries, obtains modification boron nitride;
Four, the modification boron nitride that polyvinyl resin step one taken and step 3 obtain joins in high mixer, first mix 5 ~ 60min, then go in pressing machine, it is 175 ~ 240 DEG C in temperature, pressure is under the condition of 5 ~ 45MPa, compacting 1 ~ 15h, obtains boron nitride-polyethylenespace space radiation protection compound substance.
2. the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance according to claim 1, the polyvinyl resin that it is characterized in that in step one be in Low Density Polyethylene, high density polyethylene, polyvinyl resin with super-high molecular weight one or more with arbitrarily than mixing.
3. the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance according to claim 1 and 2, it is characterized in that the coupling agent described in step one be in silane coupling agent, titanate coupling agent, aluminate coupling agent, metal composite coupling agent, phosphate coupling agent, boric acid ester coupler one or more with arbitrarily than mixing.
4. the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance according to claim 1 and 2, is characterized in that the mass ratio of the boron nitride of ethanol and step one in step 2 is 2 ~ 4:1.
5. the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance according to claim 1 and 2, is characterized in that in step 3, bath temperature is 80 ~ 90 DEG C.
6. the preparation method of a kind of boron nitride-polyethylenespace space radiation protection compound substance according to claim 1 and 2, it is characterized in that in step 4, the high-speed mixer and mixing time is 15 ~ 30min, in pressing machine, press temperature is 180 ~ 190 DEG C, and pressure is 15 ~ 25MPa.
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| CN103093844B (en) * | 2013-01-21 | 2015-08-19 | 哈尔滨工业大学 | For the application of the composite polyethylene material of the radiation proof doped carbon nanometer pipe of space charged particle and nanometer tantalum |
| CN103050162B (en) * | 2013-01-21 | 2015-10-07 | 哈尔滨工业大学 | A kind of nanometer tantalum/nm-class boron nitride-tygon space neutron shielding compound substance |
| CN103073773B (en) * | 2013-01-21 | 2015-08-26 | 哈尔滨工业大学 | For the composite polyethylene material and its preparation method and application of the radiation proof doped carbon nanometer pipe of Spacial Proton |
| CN109974526B (en) * | 2019-04-29 | 2021-07-13 | 北京空间飞行器总体设计部 | Manned lunar landing radiation protection method based on assembly shield |
| CN111825911B (en) * | 2020-07-02 | 2021-11-09 | 北京科技大学 | Polymer composite material for space neutron shielding and preparation method thereof |
| CN112745550B (en) * | 2020-12-18 | 2022-03-11 | 北京科技大学 | Neutron-shielding polymer composite material, preparation method, wire and application |
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| CN102867557A (en) | 2013-01-09 |
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