CN103086643B - Self-compact and quickly-cured pavement patching material, preparation method thereof and application - Google Patents
Self-compact and quickly-cured pavement patching material, preparation method thereof and application Download PDFInfo
- Publication number
- CN103086643B CN103086643B CN201210123613.5A CN201210123613A CN103086643B CN 103086643 B CN103086643 B CN 103086643B CN 201210123613 A CN201210123613 A CN 201210123613A CN 103086643 B CN103086643 B CN 103086643B
- Authority
- CN
- China
- Prior art keywords
- patching material
- self
- pavement patching
- thermoplastic resin
- resin binder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The invention belongs to the field of casting materials, and particularly relates to a pavement patching material with relatively high self-compaction and capable of being quickly cured, a preparation method of the pavement patching material, and application of the pavement patching material in the field of quickly carrying out rush repair. The self-compact and quickly-cured pavement patching material comprises the following components in parts by weight: 60 to 95 parts of dense aggregate, 4 to 30 parts of thermoplastic resin adhesive, and 1 to 10 parts of thermal initiation latent curing agent which can induce the thermoplastic resin adhesive to be quickly cured at a heating state. The pavement patching material can form a high-strength pavement base material within 50 to 70 minutes at a heating state, so that the time for rush repair and curing is greatly reduced.
Description
Technical field
The invention belongs to cast material field, be specifically related to a kind of self-compacting better and can quick-setting precoated sand material and preparation method thereof, and application in field, rapid rush-repair road surface.
Background technology
Along with developing rapidly of China's economy, airfield runway quantity increases sharply, and high-grade motorway is built in a large number, and the enforcement of the concrete workses such as city square and municipal highway has improved the mankind's life quality, has promoted the sound development of national economy.In existing road, adopt the more of concrete construction road surface, not only quality is good but also long service life.But more complicated is in use keeped in repair after its pavement damage in concrete road surface, need sealing to stop using and repair, need to employ larger machinery and road surface plane could be opened again and built, preserving period, is longer simultaneously.The conventional repair materials of concrete patching has quick cement or bituminous concrete or macromolecular material etc. at present, but all exist problems such as needing long-time sealing road surface finishing, curing time length, have a strong impact on for road rapid repair brings, just there is larger problem in the repairing of airport pavement especially.
Chinese patent CN101121812A discloses a kind of epoxy resin base fast repairing material, and this patching material is made up of sandstone, talcum powder, epoxy resin, polymeric amide and thinner.This fast repairing material can be used for the repairing of the concrete constructions such as bridge, tunnel, road and house, only needs concrete surface to process, and will make epoxy resin high-pressure grouting joint seal to band crack member and process when construction.This patching material easy construction, duration shorter (intensity can reach 60-70MPa in 3 days), without sealing road surface and early strength is higher, later strength is moderate.But when being used for repairing road surface, this material still relies on natural curing after grouting, and need the maintenance intensity of 3 days just can reach 60-70MPa, still need short-term sealing repairing, and taking lightweight sandstones such as sandstones as aggregate, the self-compacting ability of whole patching material is poor, also needing to fill and lead up processing when rushing to repair road surface, need the pavement patching of rapid rush-repair inapplicable for similar airport pavement etc.
Summary of the invention
For this reason, technical problem to be solved by this invention be in prior art for the curing conservation time of the material require of road surface repairing longer, affect the problem of repairing progress, and then provide the one can quick-setting self-compacting pavement patching material.
Second technical problem to be solved by this invention is to provide the application of a kind of self-compacting fast setting pavement patching material in repairing road surface.
For solving the problems of the technologies described above, self-compacting fast setting pavement patching material of the present invention is to be prepared from by the component of following weight part:
Dense aggregate 60-95 part;
Thermoplastic resin binder 4-30 part;
Under heated condition, can bring out the quick-setting thermal initiation of the described thermoplastic resin binder solidifying agent 1-10 part of hiding.
More excellent, described self-compacting fast setting covering material is to be prepared from by the component of following weight part:
Dense aggregate 85-94 part;
Thermoplastic resin binder 5-10 part;
The thermal initiation solidifying agent 1-5 part of hiding.
Described thermoplastic resin binder comprises one or more in thermoplastic resol, boron bakelite resin, modifying epoxy resin by organosilicon, phenol aldehyde modified epoxy resin or urea-formaldehyde resin.
The described thermal initiation solidifying agent of hiding comprises one or more in urotropine (regular title is: 1,3,5,7-, tetra-aza-tricycles [3.3.1.1] decane), Dyhard RU 100, hydrazides, ammonium chloride or special modified solidifying agent.
Described Dense aggregate comprises silica sand particle, pottery sand, haydite, small ball or little iron ball.
The proportion of described Dense aggregate is 1.7-8.9.
The particle diameter of described Dense aggregate is 20-200 order.
The present invention also provides a kind of method of preparing above-mentioned self-compacting fast setting pavement patching material, comprises the following steps:
(1) by the Dense aggregate heating of selected parts by weight;
(2) thermoplastic resin binder of selected parts by weight is added in described Dense aggregate while hot, and stir;
(3) solidifying agent of while hot thermal initiation being hidden adds in the reactant obtaining in step (2), and the processing of lowering the temperature after stirring;
(4) by cooling the reactant obtaining in step (3), broken and sieve, to obtain final product.
In described step (1), first described Dense aggregate is heated to 160 DEG C above to 1000 DEG C, and then is cooled to 90-160 DEG C.
The present invention also provides application, the especially application in the rush repair engineering on the road surface such as airport, expressway of a kind of above-mentioned self-compacting fast setting pavement patching material in the salvaging of road surface.
Technique scheme of the present invention has the following advantages compared to existing technology:
1, the present invention selects and mainly comprises thermoplastic resol, boron bakelite resin, silicone resin, modified epoxy, urea-formaldehyde resins etc. are high temperature resistant, the speciality polymer resin that intensity is high and the latent curing agent of thermal initiation are as main covering material, the varigrained overlay film silica sand matrix material of preparing, described covering material is under heating condition, the latent curing agent that is wrapped in Dense aggregate surface can decomposite active intermediate, the thermoplastic resin that is simultaneously the wrapped in Dense aggregate surface deliquescing of being also heated, flow, last latent curing agent discharges to such an extent that chemical reaction can occur for active substance and resin, crosslinking curing, film covered resin is heat cured three dimensional structure by the linear structural transformation of original thermoplasticity, between final overlay film silica sand, can be subject to thermoforming, in heating 50-70min, can form high strength road surface base material, greatly shorten and rushed to repair the curing time,
2, described Dense aggregate is silica sand particle, pottery sand, haydite, small ball or the little iron ball with certain deadweight and particle diameter, can meet in the time of road rapid repair, for the requirement of repair materials self-compacting ability, while macrobead material also contributes to promote solidification intensity and saves material simultaneously;
3, screening by analysis, described thermoplastic resin binder and the described thermal initiation ratio that solidifying agent selects of hiding is 4-30:1-10, that more excellent is 5-10:1-5, can ensure to mix with ratio preferably that to cause curing effect better simultaneously, ensure solidification intensity and shorten set time, meeting the requirement to repairing time and repairing intensity in the salvaging of road surface;
4, Dense aggregate is inert material, poor with the adhesive property of macromolecular material, technique of the present invention is first mixed described thermoplastic resin binder with Dense aggregate while hot mutually, employing is similar to overlay film principle, make the overall adhesive property of described patching material better, mix with the described thermal initiation solidifying agent of hiding while hot again, also contribute to strengthen the intensity of described patching material;
5, the covering material acid-proof alkaline of gained of the present invention is better, can reach at short notice after tested higher resistance intensity.
Brief description of the drawings
For content of the present invention is more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is the cross section structure schematic diagram of the electric heater unit described in the embodiment of the present invention 6;
Fig. 2 is the method schematic diagram on rapid rush-repair road surface described in the embodiment of the present invention 6;
Fig. 3 is the method schematic diagram on rapid rush-repair road surface described in the embodiment of the present invention 7.
In figure, Reference numeral is expressed as: 1-supporter, 2-calrod, 3-catch, 21-outer face, 4-concrete, 5-patching material, 6-electrically heated frame.
Embodiment
Resol described in the embodiment of the present invention, boron bakelite resin and urea-formaldehyde resin all can select the commercially available product in existing market can realize effect of the present invention; Described modifying epoxy resin by organosilicon is selected existing 665 commercially available type organosilicon epoxy resins; Described phenol aldehyde modified epoxy resin is selected South Asia, Taiwan NOON-638 model resin, so that the effect of each embodiment to be described.
Embodiment 1
Self-compacting fast setting pavement patching material described in the present embodiment is prepared in accordance with the following methods by the component of following weight part:
(1) be that the pottery sand aggregate that 70-140 order, proportion are 1.8-2.0 is heated to 150-160 DEG C by 60 parts of particle diameters;
(2) while hot the novolac resin of 30 parts added in described pottery sand aggregate and stir, obtaining stable mixture;
(3) while hot 1 part of urotropine is added in the reactant obtaining in step (2), and cooling naturally after stirring;
(4) reactant obtaining in step (3) being cooled to room temperature and being crushed to particle diameter is 70-140 order, and sieves, and obtains required patching material.
The preparation-obtained patching material of the present embodiment after tested, only needs heating 60min, and its intensity can reach 45MPa, can reach the requirement of strength on airport or road surface, expressway completely.
Embodiment 2
Self-compacting fast setting pavement patching material described in the present embodiment is prepared in accordance with the following methods by the component of following weight part:
(1) be that the haydite aggregate that 70-140 order, proportion are 1.7-2.5 is heated to 700-800 DEG C by 95 parts of particle diameters, and naturally cool to 90-100 DEG C subsequently;
(2) while hot the thermoplasticity boron bakelite resin of 4 parts added in described haydite aggregate and stir, obtaining stable mixture;
(3) while hot 10 parts of urotropines are mixed and added in the reactant obtaining in step (2), and cooling naturally after stirring;
(4) reactant obtaining in step (3) being cooled to room temperature and being crushed to particle diameter is 70-140 order, and sieves, and obtains required patching material.
The preparation-obtained patching material of the present embodiment after tested, only needs heating 65min, and its intensity can reach 48MPa, can reach the requirement of strength on airport or road surface, expressway completely.
Embodiment 3
Self-compacting fast setting pavement patching material described in the present embodiment is prepared in accordance with the following methods by the component of following weight part:
(1) be that the small ball aggregate that 20-40 order, proportion are 7.9 is heated to 160-200 DEG C by 85 parts of particle diameters, and naturally cool to 90-100 DEG C subsequently;
(2) while hot the modifying epoxy resin by organosilicon of 10 parts is added in described small ball aggregate, mix, obtain stable mixture;
(3) while hot 2 parts of ammonium chlorides are added in the reactant obtaining in step (2), and cooling naturally after stirring;
(4) reactant obtaining in step (3) being cooled to room temperature and being crushed to particle diameter is 20-40 order, and sieves, and obtains required patching material.
The preparation-obtained patching material of the present embodiment after tested, only needs heating 70min, and its intensity can reach 60MPa, can reach the requirement of strength on airport or road surface, expressway completely.
Embodiment 4
Self-compacting fast setting pavement patching material described in the present embodiment is prepared in accordance with the following methods by the component of following weight part:
(1) be that the little iron ball aggregate that 20-40 order, proportion are 7.8-8.9 is heated to 500-600 DEG C by 94 parts of particle diameters, and naturally cool to 100-120 DEG C subsequently;
(2) while hot the thermoplasticity urea-formaldehyde resin of 5 parts added in described little iron ball aggregate and stir, obtaining stable mixture;
(3) while hot 5 parts of special modified solidifying agent are added in the reactant obtaining in step (2), and cooling naturally after stirring;
(4) reactant obtaining in step (3) being cooled to room temperature and being crushed to particle diameter is 20-40 order, and sieves, and obtains required patching material.
The preparation-obtained patching material of the present embodiment after tested, only needs heating 60min, and its intensity can reach 50MPa, can reach the requirement of strength on airport or road surface, expressway completely.
Embodiment 5
Self-compacting fast setting pavement patching material described in the present embodiment is prepared in accordance with the following methods by the component of following weight part:
(1) be that the silica sand granulated aggregate that 100-200 order, proportion are 1.7 is heated to 300-500 DEG C by 90 parts of particle diameters, and naturally cool to 120-140 DEG C subsequently;
(2) while hot the mixture of the phenol aldehyde modified epoxy resin of 7 parts and novolac resin added in described silica sand granulated aggregate and stir, obtaining stable mixture, the blending ratio of described phenol aldehyde modified epoxy resin and novolac resin is not limit;
(3) while hot 3 parts of Dyhard RU 100s are added in the reactant obtaining in step (2) with the mixture (the two mixes with the mass ratio of 3:1) of succinic acid hydrazide ii, and cooling naturally after stirring;
(4) reactant obtaining in step (3) being cooled to room temperature and being crushed to particle diameter is 100-200 order, and sieves, and obtains required patching material.
The preparation-obtained patching material of the present embodiment after tested, only needs heating 50min, and its intensity can reach 55MPa, can reach the requirement of strength on airport or road surface, expressway completely.
Embodiment 6
The method on the rapid rush-repair road surface described in the present embodiment, comprises the steps:
(1) as shown in Figure 2, damaged concrete 4 is backfilled to damage location place and rebuilds smoothly, then electric heater unit is positioned in damaged road surface depression;
As shown in Figure 1, described electric heater unit comprises: spherical supports 1, and be arranged at the multiple calrods 2 on described supporter 1 periphery; Described calrod 2 inserts in described supporter 1, between described calrod 2, is connected in parallel; The profile that described calrod 2 forms in the outer face 21 away from described supporter 1 is spherical.
Described electric heater unit also comprises the catch 3 on the outer face 21 that is arranged at described calrod 2; Described catch 3 is arc-shaped flaky; The area of described catch 3 is greater than the cross-sectional area of described calrod 2; Gap length between adjacent described catch 3 is less than the diameter of described calrod 2.The profile that multiple described catch 3 form is spherical.
As a kind of mode that can replace, described supporter 1 can also be other shapes such as cylindrical tubbiness.
Multiple calrods 2 are arranged in parallel mutually, are connected respectively with power supply, the temperature controller of connecting in electric loop; When work, the plug of electric wire one end is switched on power, temperature controller is by the temperature of automatic control electric hot pin 2, and catch 3 is heated simultaneously;
(2) patching material 5 described in embodiment 4 is filled in damaged road surface depression, and covers described electric heater unit, start described electric heater unit heating 50-60min so that described patching material 5 is subject to thermofixation simultaneously, can realize the repairing of damaged road surface.
Embodiment 7
The method on the rapid rush-repair road surface described in the present embodiment, comprises the steps:
(1) as shown in Figure 3, damaged concrete 4 is backfilled to damage location place and rebuilds smoothly, then electrically heated frame 6 is positioned in damaged road surface depression;
(2) patching material 5 described in embodiment 5 is filled in damaged road surface depression, and covers described electrically heated frame 6, start described electrically heated frame 6 simultaneously and heat 50-60min so that described patching material 5 is subject to thermofixation, can realize the repairing of damaged road surface.
Obviously, above-described embodiment is only for example is clearly described, and the not restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being extended out thus or variation are still among the protection domain in the invention.
Claims (7)
1. a self-compacting fast setting pavement patching material, is characterized in that, is to be prepared from by the component of following weight part:
Dense aggregate 60-95 part;
Thermoplastic resin binder 4-30 part;
Under heated condition, bring out the quick-setting thermal initiation of the described thermoplastic resin binder solidifying agent 1-10 part of hiding; Wherein,
Described thermoplastic resin binder comprises one or more in thermoplastic resol, boron bakelite resin, modifying epoxy resin by organosilicon, phenol aldehyde modified epoxy resin or urea-formaldehyde resin;
The described quick-setting thermal initiation of the described thermoplastic resin binder solidifying agent of hiding that brings out under heated condition comprises one or more in urotropine, Dyhard RU 100, hydrazides, ammonium chloride;
Described Dense aggregate comprises silica sand particle, pottery sand, haydite, small ball or little iron ball.
2. self-compacting fast setting pavement patching material according to claim 1, is characterized in that, is to be prepared from by the component of following weight part:
Described Dense aggregate 85-94 part;
Described thermoplastic resin binder 5-10 part;
Describedly under heated condition, bring out the quick-setting thermal initiation of the described thermoplastic resin binder solidifying agent 2-5 part of hiding.
3. self-compacting fast setting pavement patching material according to claim 1 and 2, is characterized in that:
The proportion of described Dense aggregate is 1.7-8.9.
4. self-compacting fast setting pavement patching material according to claim 3, is characterized in that:
The particle diameter of described Dense aggregate is 20-200 order.
5. a method of preparing the arbitrary described self-compacting fast setting pavement patching material of claim 1-4, is characterized in that, comprises the following steps:
(1) by the Dense aggregate heating of selected parts by weight;
(2) thermoplastic resin binder of selected parts by weight is added in described Dense aggregate while hot, and stir;
(3) while hot selected parts by weight described brought out under heated condition to the quick-setting thermal initiation of the described thermoplastic resin binder solidifying agent of hiding and add in the reactant obtaining in step (2), and the processing of lowering the temperature after stirring;
(4) by cooling the reactant obtaining in step (3), broken and sieve, to obtain final product.
6. the method for preparing self-compacting fast setting pavement patching material according to claim 5, is characterized in that:
In described step (1), first described Dense aggregate is heated to 160 DEG C above to 1000 DEG C, and then is cooled to 90-160 DEG C.
7. the application of the arbitrary described self-compacting fast setting pavement patching material of a claim 1-4 in the salvaging of road surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123613.5A CN103086643B (en) | 2012-04-25 | 2012-04-25 | Self-compact and quickly-cured pavement patching material, preparation method thereof and application |
| PCT/CN2013/074751 WO2013159729A1 (en) | 2012-04-25 | 2013-04-25 | Self-compacting and rapidly solidified pavement repair material, and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210123613.5A CN103086643B (en) | 2012-04-25 | 2012-04-25 | Self-compact and quickly-cured pavement patching material, preparation method thereof and application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103086643A CN103086643A (en) | 2013-05-08 |
| CN103086643B true CN103086643B (en) | 2014-12-03 |
Family
ID=48199841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210123613.5A Active CN103086643B (en) | 2012-04-25 | 2012-04-25 | Self-compact and quickly-cured pavement patching material, preparation method thereof and application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103086643B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107034760A (en) * | 2017-04-01 | 2017-08-11 | 东南大学 | A kind of Fire-damaged method for maintaining of steel bridge deck asphalt concrete pavement layer |
| CN107382138B (en) * | 2017-07-25 | 2019-11-26 | 山东建筑大学 | A kind of room temperature self-curing airfield pavement patching material and preparation method thereof |
| CN107298543B (en) * | 2017-07-25 | 2020-05-22 | 山东建筑大学 | Room-temperature self-compacting airport pavement repairing material and preparation method thereof |
| CN109365740B (en) * | 2018-10-29 | 2020-06-16 | 江苏亚威铸造材料科技有限公司 | Preparation method of thermal-stable precoated sand |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665340A (en) * | 2005-12-26 | 2010-03-10 | 北京仁创科技集团有限公司 | Weather resistance permeable material and application thereof |
| CN101665686A (en) * | 2008-09-04 | 2010-03-10 | 北京仁创科技集团有限公司 | Method for preparing surface-modified proppant |
| CN101768432A (en) * | 2008-12-29 | 2010-07-07 | 北京仁创科技集团有限公司 | Corrosion-resistant propping agent |
-
2012
- 2012-04-25 CN CN201210123613.5A patent/CN103086643B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101665340A (en) * | 2005-12-26 | 2010-03-10 | 北京仁创科技集团有限公司 | Weather resistance permeable material and application thereof |
| CN101665686A (en) * | 2008-09-04 | 2010-03-10 | 北京仁创科技集团有限公司 | Method for preparing surface-modified proppant |
| CN101768432A (en) * | 2008-12-29 | 2010-07-07 | 北京仁创科技集团有限公司 | Corrosion-resistant propping agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103086643A (en) | 2013-05-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106202651B (en) | A kind of optimum design method of heat regeneration asphalt mixture mineral aggregate gradation | |
| CN103086643B (en) | Self-compact and quickly-cured pavement patching material, preparation method thereof and application | |
| CN103834186B (en) | A kind of warm mix fast curable epoxy bituminous material and preparation method thereof | |
| CN104312510B (en) | A kind of magnetic thermal curing methods of thermosetting adhesive | |
| CN106316221B (en) | A kind of rubber cold mixing epoxy asphalt mixture and preparation method for crack repairing | |
| CN103086642B (en) | Oxygen-releasing quick curing patching material as well as preparation method and application of material | |
| CN108117306B (en) | A kind of fibre-reinforced asphalt and preparation method thereof | |
| CN105462273A (en) | Epoxy modified emulsified asphalt material and preparation method thereof | |
| CN105419233A (en) | Epoxy resin curing material system for high-temperature mixed epoxy asphalt and preparation method thereof | |
| CN110196318B (en) | Method for detecting fusion degree of cement emulsified asphalt and old asphalt | |
| Liu et al. | Induction heating performance of asphalt pavements incorporating electrically conductive and magnetically absorbing layers | |
| CN102584109A (en) | Epoxy resin concrete material and microwave-coagulation preparation method thereof | |
| CN111574109A (en) | Epoxy asphalt mastic macadam mixture suitable for airport pavement and preparation method thereof | |
| CN105236827A (en) | Epoxy resin glue sand used for rapid repairing and microwave curing method thereof | |
| CN103086649B (en) | Method for rushing to repair damaged road surfaces rapidly | |
| Sun et al. | Effects of microcapsules on self-healing performance of asphalt materials under different loading modes | |
| CN111170678A (en) | Pouring type concrete with polyurethane as binder and preparation method thereof | |
| Liu et al. | Effect of curing reaction behaviors of warm mix epoxy asphalt concrete on its field compaction characteristics using discrete-element method | |
| CN105733281A (en) | Heating type modified asphalt high-molecular polymer crack pouring adhesive and method for preparing same | |
| CN105385176A (en) | Expanded vermiculite/waste rubber powder composite modified asphalt material and preparation method thereof | |
| CN103205128B (en) | Warm mixed asphalt concrete additive and preparation method thereof | |
| CN108429218A (en) | The method that cable channel cover plate is prepared using retired insulator rubber and plug powder | |
| CN106634919B (en) | A kind of containing consolidated sand system and preparation method thereof and application method | |
| CN107964206A (en) | A kind of bituminous concrete aggregate Interface enhancer and preparation method thereof | |
| CN108250775A (en) | Response type asphalt cold repairing liquid and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190911 Address after: 246600, No. 1, general road, Yuexi Economic Development Zone, Anqing, Anhui Patentee after: Renchuang ecological environmental protection Polytron Technologies Inc Address before: 100085, B, building 5, building 9, Wah Wah Street, 3rd Street, Beijing, Haidian District Patentee before: Beijing Renchuang Sci-Tech Group Corp., Ltd. |
|
| TR01 | Transfer of patent right |