CN107572859A - A kind of regeneration concrete economization agent and preparation method thereof - Google Patents
A kind of regeneration concrete economization agent and preparation method thereof Download PDFInfo
- Publication number
- CN107572859A CN107572859A CN201710767254.XA CN201710767254A CN107572859A CN 107572859 A CN107572859 A CN 107572859A CN 201710767254 A CN201710767254 A CN 201710767254A CN 107572859 A CN107572859 A CN 107572859A
- Authority
- CN
- China
- Prior art keywords
- parts
- regeneration concrete
- economization agent
- water
- waterglass
- 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.)
- Granted
Links
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of regeneration concrete economization agent, it is made up of following raw material according to parts by weight：36 parts of waterglass, 0.5 2 parts of calcium oxide, 15 28 parts of polyacrylamide, 45 60 parts of flyash, 0.1 0.8 parts of potassium silicate, 28 parts of polyethylene glycol, 14 parts of polypropylene fibre, 25 parts of aloe, help 50 70 parts of 3 12 parts of film forming matter and water.The present invention also disclosed the preparation method and application method of the product.The product infiltrates through the inside of regeneration concrete, filling regeneration concrete micropore chemically reacts with the material in regeneration concrete, generation reduces the surface tension of water in regeneration concrete internal capillaries with closely knit material is expanded, it is possible to reduce regeneration concrete shrinks；Waterglass and help film forming matter to form one layer of water-retaining film, can prevent moisture evaporation and economization agent from volatilizing, this product is nontoxic, tasteless, environmentally safe, suitable for various environment and the regeneration concrete top layer of condition.
Description
Technical field
The present invention relates to regeneration concrete field, specifically a kind of regeneration concrete economization agent.
Background technology
Concrete is the maximum construction material of Contemporary Architecture engineering dosage, come out from cement in 1824 and concrete therewith
Since birth, the history of existing nearly 200 years so far, concrete works technology invariably accompanies the needs and science skill of engineering construction
What art developed and improved.With the reduction of resource, people have developed regeneration concrete.Regeneration concrete refers to will be discarded
Concrete block mixes with grading by a certain percentage after broken, cleaning, classification, partly or entirely replaces the natural collection such as sandstone
Material (mainly coarse aggregate), adds cement, water etc. and matches somebody with somebody the novel concrete formed.At the same time, regeneration concrete was being applied
The problem of many new occurs in journey, especially prominent in recent years is the durability deterioration problem of regeneration concrete.Due to durable
Property deficiency cause structure destroy accident happen occasionally, the economic loss thereby resulted in is also to be difficult to estimate.
Concrete Engineering Cracks Producing reason is a lot, is related to material mix proportion, structure design, construction and late maintaining
Intersect influence and effect Deng links, and between these factors so that Concrete Engineering Cracks control becomes very
It is complicated.From the point of view of the features such as engineering structure failure damage, regeneration concrete material mix proportion should be control engineering crackses the
One key element, crack is the macroscopical form that structure damage inactivation is showed, and the mechanism process for producing crack is and regeneration concrete
Material body change is closely related, and the generation of early concrete engineering crackses is except in addition to by various load function influences, regeneration is mixed
The contraction for coagulating soil is very crucial.Currently in control regeneration concrete cracking Optimal Mix Design, there are addition fiber, expansion
The measure such as agent and economization agent, its purpose is all to reduce various contraction distortions, but the mechanism of action of various additives and effect have
It is different.For the addition of fiber, it prevents the extension and extension in crack to a certain extent, but it primarily serve it is scattered or
The effect of shrinkage stress distribution is homogenized, and the generation in crack can not be inherently eliminated；Swelling agent is by being produced with hydrated cementitious
Thing carries out a series of chemical reaction, and generation expansion crystallographic carrys out the contraction of compensating concrete, and it is anti-that this process wants substantial amounts of water to participate in
Should, in the case where maintenance is bad (such as moisture is insufficient), the effect of prestressed of swelling agent can not give full play to, therefore its quality
It is unstable, the bad adaptability with regeneration concrete system, control swell increment and Bulking Time all unmanageable；Traditional decrement
Agent is the surface tension by reducing liquid phase in concrete capillary, declines capillary negative pressure, reduce shrinkage stress, performance compared with
The above two are good, but because its cost is higher, therefore limit the scope of its popularization and application.
The content of the invention
It is an object of the invention to provide a kind of regeneration concrete economization agent, is asked with solve to propose in above-mentioned background technology
Topic.
To achieve the above object, the present invention provides following technical scheme：
A kind of regeneration concrete economization agent, is made up of following raw material according to parts by weight：Waterglass 3-6 parts, calcium oxide 0.5-2
Part, polyacrylamide 15-28 parts, flyash 45-60 parts, potassium silicate 0.1-0.8 parts, polyethylene glycol 2-8 parts, polypropylene fibre 1-
4 parts, aloe 2-5 parts, help film forming matter 3-12 parts and water 50-70 parts.
As the further scheme of the present invention：Film forming matter is helped to use Lauryl Alcohol ester or butadiene-styrene latex, the grain of calcium oxide
Spend for 50-80 mesh.
As the further scheme of the present invention：The mean molecule quantity of polyacrylamide is (300-800) × 104, polypropylene
The mean molecule quantity of fiber is 6000-10000, and the mean molecule quantity of polyethylene glycol is 200-2000, and the modulus of waterglass is
1.2-1.5。
The preparation method of the regeneration concrete economization agent, is comprised the following steps that：
Step 1,2-4 times of deionized water of calcium oxide and calcium oxide weight is mixed, stirred between 55-70 degrees Celsius
Milk of lime is heated into, is then slowly added into flyash and potassium silicate, is kept for heating-up temperature and stirring 40-60 minutes, after cooling
To the first mixed solution；
Step 2, aloe is steeped into the 30-45 minutes in the ethanol that mass fraction is 70-85%, then using shooting flow
Body extraction extracts, and obtains Aloe essential liquid；
Step 3, polyacrylamide, waterglass and polypropylene fibre are mixed, are then placed in 0.8-1mol/L hydroxide
In sodium solution, add and help film forming matter, it is uniform with ultrasonic wave dispersing and dissolving, after adding phenolphthalein indicator, then hydrochloric acid is passed through, until
Untill the no longer aobvious red of solution, then by obtained solution under 50-70 degrees Celsius, 30-50 minutes are incubated, obtain the second mixing
Solution；
Step 4, polyethylene glycol, the first mixed solution, Aloe essential liquid and the second mixed solution are well mixed, low temperature
Constant weight is dried to, after carrying out ultra-fine grinding and vibration swelling, crosses 100-150 mesh sieves, you can obtain finished product.
As the further scheme of the present invention：The molar concentration of hydrochloric acid is 0.1-0.3mol/L in step 3, in step 4
Drying temperature be 28-35 degrees Celsius.
The application method of the regeneration concrete economization agent, is comprised the following steps that：Economization agent water suction saturation is formed solidifying
Colloid, gelinite and regeneration concrete mixing water are together added, are well mixed.
Compared with prior art, the beneficial effects of the invention are as follows：The products material wide material sources, preparation technology is simple, raw
It is low to produce equipment investment cost, suitable for large-scale industrial production；Each component plays synergy in the product, infiltrates through regeneration
The inside of concrete, fill regeneration concrete micropore or chemically reacted with the material in regeneration concrete, generation has swollen
Swollen closely knit material, reduce the surface tension of water in regeneration concrete internal capillaries, it is possible to reduce regeneration concrete shrinks, and does not have
There are other adverse side effects；Waterglass and help film forming matter to form one layer of water-retaining film, can prevent moisture evaporation and economization agent from volatilizing,
Intensity is improved, this product is nontoxic, tasteless, environmentally safe, easy to use, suitable for various environment and the regeneration coagulation of condition
Native top layer.
Embodiment
The technical scheme of this patent is described in more detail with reference to embodiment.
Embodiment 1
A kind of regeneration concrete economization agent, is made up of following raw material according to parts by weight：3 parts of waterglass, 0.5 part of calcium oxide,
15 parts of polyacrylamide, 45 parts of flyash, 0.1 part of potassium silicate, 2 parts of polyethylene glycol, 1 part of polypropylene fibre, 2 parts of aloe, furtherance
50 parts of 3 parts of film thing and water.Film forming matter is helped to use Lauryl Alcohol ester, the granularity of calcium oxide is 50 mesh.
The preparation method of the regeneration concrete economization agent, is comprised the following steps that：
Step 1,3 times of deionized water of calcium oxide and calcium oxide weight is mixed, between 55 degrees Celsius agitating and heating into
Milk of lime, flyash and potassium silicate are then slowly added into, keep heating-up temperature and stir 44 minutes, the first mixing is obtained after cooling
Solution；
Step 2, by aloe bubble 40 minutes in the ethanol that mass fraction is 72%, then using supercritical fluid extraction
Method extracts, and obtains Aloe essential liquid；
Step 3, polyacrylamide, waterglass and polypropylene fibre are mixed, and the sodium hydroxide for being then placed in 1mol/L is molten
In liquid, Lauryl Alcohol ester is added, it is uniform with ultrasonic wave dispersing and dissolving, after adding phenolphthalein indicator, then hydrochloric acid is passed through, Zhi Daorong
Untill the no longer aobvious red of liquid, then by obtained solution under 57 degrees Celsius, 36 minutes are incubated, obtains the second mixed solution；
Step 4, polyethylene glycol, the first mixed solution, Aloe essential liquid and the second mixed solution are well mixed, low temperature
Constant weight is dried to, after carrying out ultra-fine grinding and vibration swelling, crosses 100 mesh sieves, you can obtain finished product.
The application method of the regeneration concrete economization agent, is comprised the following steps that：Economization agent water suction saturation is formed solidifying
Colloid, gelinite and regeneration concrete mixing water are together added, are well mixed..
Embodiment 2
A kind of regeneration concrete economization agent, is made up of following raw material according to parts by weight：4 parts of waterglass, 1 part of calcium oxide, gather
19 parts of acrylamide, 52 parts of flyash, 0.4 part of potassium silicate, 5 parts of polyethylene glycol, 2 parts of polypropylene fibre, 3 parts of aloe, furtherance film
59 parts of 6 parts of thing and water.The mean molecule quantity of polyacrylamide is (300-800) × 104, the mean molecule quantity of polypropylene fibre is
6000-10000, the mean molecule quantity of polyethylene glycol is 200-2000, and the modulus of waterglass is 1.4.
The preparation method of the regeneration concrete economization agent, is comprised the following steps that：
Step 1,4 times of deionized water of calcium oxide and calcium oxide weight is mixed, between 58 degrees Celsius agitating and heating into
Milk of lime, flyash and potassium silicate are then slowly added into, keep heating-up temperature and stir 40 minutes, the first mixing is obtained after cooling
Solution；
Step 2, by aloe bubble 30 minutes in the ethanol that mass fraction is 70%, then using supercritical fluid extraction
Method extracts, and obtains Aloe essential liquid；
Step 3, polyacrylamide, waterglass and polypropylene fibre are mixed, are then placed in 0.8mol/L sodium hydroxide
In solution, add and help film forming matter, it is uniform with ultrasonic wave dispersing and dissolving, after adding phenolphthalein indicator, then it is passed through 0.1mol/L's
Hydrochloric acid, untill the no longer aobvious red of solution, then by obtained solution under 56 degrees Celsius, 38 minutes are incubated, obtains second
Mixed solution；
Step 4, polyethylene glycol, the first mixed solution, Aloe essential liquid and the second mixed solution are well mixed, 30
Constant weight is dried under degree Celsius, after carrying out ultra-fine grinding and vibration swelling, crosses 120 mesh sieves, you can obtain finished product.
The application method of the regeneration concrete economization agent, is comprised the following steps that：Economization agent water suction saturation is formed solidifying
Colloid, gelinite and regeneration concrete mixing water are together added, are well mixed.
Embodiment 3
A kind of regeneration concrete economization agent, is made up of following raw material according to parts by weight：6 parts of waterglass, 2 parts of calcium oxide, gather
26 parts of acrylamide, 56 parts of flyash, 0.7 part of potassium silicate, 7 parts of polyethylene glycol, 4 parts of polypropylene fibre, 5 parts of aloe, furtherance film
65 parts of 11 parts of thing and water.Film forming matter is helped to use butadiene-styrene latex, the granularity of calcium oxide is 60 mesh.The mean molecule quantity of polyacrylamide
For (300-800) × 104, the mean molecule quantity of polypropylene fibre is 6000-10000, and the mean molecule quantity of polyethylene glycol is
200-2000, the modulus of waterglass is 1.5.
The preparation method of the regeneration concrete economization agent, is comprised the following steps that：
Step 1,4 times of deionized water of calcium oxide and calcium oxide weight is mixed, between 68 degrees Celsius agitating and heating into
Milk of lime, flyash and potassium silicate are then slowly added into, keep heating-up temperature and stir 55 minutes, the first mixing is obtained after cooling
Solution；
Step 2, by aloe bubble 42 minutes in the ethanol that mass fraction is 82%, then using supercritical fluid extraction
Method extracts, and obtains Aloe essential liquid；
Step 3, polyacrylamide, waterglass and polypropylene fibre are mixed, are then placed in 0.8mol/L sodium hydroxide
In solution, butadiene-styrene latex is added, it is uniform with ultrasonic wave dispersing and dissolving, after adding phenolphthalein indicator, then it is passed through 0.2mol/L's
Hydrochloric acid, untill the no longer aobvious red of solution, then by obtained solution under 65 degrees Celsius, 48 minutes are incubated, obtains second
Mixed solution；
Step 4, polyethylene glycol, the first mixed solution, Aloe essential liquid and the second mixed solution are well mixed, 35
Constant weight is dried under degree Celsius, after carrying out ultra-fine grinding and vibration swelling, crosses 150 mesh sieves, you can obtain finished product.
The application method of the regeneration concrete economization agent, is comprised the following steps that：Economization agent water suction saturation is formed solidifying
Colloid, gelinite and regeneration concrete mixing water are together added, are well mixed.
The product infiltrates through the inside of regeneration concrete, fill regeneration concrete micropore or with the material in regeneration concrete
Chemically react, generation reduces the surface tension of water in regeneration concrete internal capillaries with closely knit material is expanded, can
To reduce regeneration concrete contraction；Waterglass and help film forming matter formed one layer of water-retaining film, moisture evaporation and economization agent can be prevented
Volatilization.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (6)
1. a kind of regeneration concrete economization agent, it is characterised in that be made up of following raw material according to parts by weight：Waterglass 3-6 parts, oxygen
Change calcium 0.5-2 parts, polyacrylamide 15-28 parts, flyash 45-60 parts, potassium silicate 0.1-0.8 parts, polyethylene glycol 2-8 parts, poly-
Tacryl 1-4 parts, aloe 2-5 parts, help film forming matter 3-12 parts and water 50-70 parts.
2. regeneration concrete economization agent according to claim 1, it is characterised in that described to help film forming matter to use Lauryl Alcohol
Ester or butadiene-styrene latex, the granularity of calcium oxide is 50-80 mesh.
3. regeneration concrete economization agent according to claim 1 or 2, it is characterised in that the polyacrylamide is averaged
Molecular weight is (300-800) × 104, the mean molecule quantity of polypropylene fibre is 6000-10000, the mean molecule of polyethylene glycol
Measure as 200-2000, the modulus of waterglass is 1.2-1.5.
A kind of 4. preparation method of regeneration concrete economization agent as described in claim 1-3 is any, it is characterised in that specific step
It is rapid as follows：
Step 1,2-4 times of deionized water of calcium oxide and calcium oxide weight is mixed, the agitating and heating between 55-70 degrees Celsius
Into milk of lime, flyash and potassium silicate are then slowly added into, is kept for heating-up temperature and stirring 40-60 minutes, the is obtained after cooling
One mixed solution；
Step 2, aloe is steeped into the 30-45 minutes in the ethanol that mass fraction is 70-85%, then extracted using supercritical fluid
Extraction is followed the example of, obtains Aloe essential liquid；
Step 3, polyacrylamide, waterglass and polypropylene fibre are mixed, and the sodium hydroxide for being then placed in 0.8-1mol/L is molten
In liquid, add and help film forming matter, it is uniform with ultrasonic wave dispersing and dissolving, after adding phenolphthalein indicator, then hydrochloric acid is passed through, until solution
Untill no longer aobvious red, then by obtained solution under 50-70 degrees Celsius, 30-50 minutes are incubated, it is molten to obtain the second mixing
Liquid；
Step 4, polyethylene glycol, the first mixed solution, Aloe essential liquid and the second mixed solution are well mixed, low temperature drying
To constant weight, after carrying out ultra-fine grinding and vibration swelling, 100-150 mesh sieves are crossed, you can obtain finished product.
5. the preparation method of regeneration concrete economization agent according to claim 4, it is characterised in that salt in the step 3
The molar concentration of acid be 0.1-0.3mol/L, and the drying temperature in step 4 is 28-35 degrees Celsius.
6. the application method of the regeneration concrete economization agent according to claim 1-3, it is characterised in that specific steps are such as
Under：Economization agent water suction saturation is formed into gelinite, gelinite and regeneration concrete mixing water are together added, are well mixed i.e.
Can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710767254.XA CN107572859B (en) | 2017-08-31 | 2017-08-31 | A kind of regeneration concrete economization agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710767254.XA CN107572859B (en) | 2017-08-31 | 2017-08-31 | A kind of regeneration concrete economization agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107572859A true CN107572859A (en) | 2018-01-12 |
| CN107572859B CN107572859B (en) | 2019-11-15 |
Family
ID=61030066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710767254.XA Active CN107572859B (en) | 2017-08-31 | 2017-08-31 | A kind of regeneration concrete economization agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107572859B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113929374A (en) * | 2021-11-08 | 2022-01-14 | 临沂金鲁新型建材有限公司 | Recycled concrete additive and preparation method thereof |
| US11339253B2 (en) | 2018-07-26 | 2022-05-24 | Beijing University Of Technology | End-group functionalized comb structure polycarboxylic acid and method for preparing the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367633A (en) * | 2008-09-24 | 2009-02-18 | 武汉大学 | Intelligent shrinkage reducing agent for concrete, preparation method and application thereof |
| CN101531482A (en) * | 2009-04-22 | 2009-09-16 | 江苏鼎达建材有限公司 | Shrinkage reducing and curing agent for concrete |
| CN101565284A (en) * | 2009-06-03 | 2009-10-28 | 四川华蓥建工集团有限公司 | Multifunctional cement concrete reducing and anti-cracking curing agent |
| US20150152011A1 (en) * | 2013-11-29 | 2015-06-04 | Nano And Advanced Materials Institute Limited | Hydrophobic low shrinkage lightweight cementitious matrix |
-
2017
- 2017-08-31 CN CN201710767254.XA patent/CN107572859B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367633A (en) * | 2008-09-24 | 2009-02-18 | 武汉大学 | Intelligent shrinkage reducing agent for concrete, preparation method and application thereof |
| CN101531482A (en) * | 2009-04-22 | 2009-09-16 | 江苏鼎达建材有限公司 | Shrinkage reducing and curing agent for concrete |
| CN101565284A (en) * | 2009-06-03 | 2009-10-28 | 四川华蓥建工集团有限公司 | Multifunctional cement concrete reducing and anti-cracking curing agent |
| US20150152011A1 (en) * | 2013-11-29 | 2015-06-04 | Nano And Advanced Materials Institute Limited | Hydrophobic low shrinkage lightweight cementitious matrix |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11339253B2 (en) | 2018-07-26 | 2022-05-24 | Beijing University Of Technology | End-group functionalized comb structure polycarboxylic acid and method for preparing the same |
| CN113929374A (en) * | 2021-11-08 | 2022-01-14 | 临沂金鲁新型建材有限公司 | Recycled concrete additive and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107572859B (en) | 2019-11-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105541384B (en) | A kind of ultralight foam concrete and preparation method thereof | |
| CN107324735B (en) | Ultra-light foam concrete and preparation method thereof | |
| CN104829189B (en) | Phase-change energy-storing composite foam concrete block | |
| CN106365536B (en) | Self-compaction expansive concrete | |
| CN110372290B (en) | High-content volcanic ash foamed concrete material and preparation method thereof | |
| CN109626906A (en) | A kind of water-tight concrete and its preparation process | |
| CN109534753A (en) | A kind of anti-crack concrete and its preparation process | |
| CN108439887A (en) | A kind of foam concrete block and preparation method thereof | |
| CN109455999A (en) | Self-compaction expansive concrete and preparation method thereof | |
| CN108484069A (en) | A kind of enhancing concrete for plant growth and preparation method thereof | |
| CN102887720B (en) | Method for preparing light thermal insulation wall material comprising straw | |
| CN110627423A (en) | High-heat-resistance self-insulation building block for energy-saving building and preparation process thereof | |
| CN109824323A (en) | A kind of steel bamboo composite fibre regeneration thermal insulation concrete and preparation method thereof | |
| CN114276071A (en) | Durable building wall material and processing method | |
| CN107572859B (en) | A kind of regeneration concrete economization agent and preparation method thereof | |
| CN110550921A (en) | anti-cracking autoclaved aerated concrete block and production method thereof | |
| CN109928686A (en) | Accelerate the high performance concrete of condensation hardening | |
| CN110128081B (en) | Concrete and preparation method thereof | |
| CN115231893B (en) | Shrinkage-compensating self-compacting expansive concrete and preparation method thereof | |
| CN107902967A (en) | A kind of the Yellow River silt particle Application in Building cracking resistance, bonding, thermal insulation mortar dry substance and preparation method thereof | |
| CN109553375A (en) | A kind of retarded concrete and its preparation process | |
| CN109942244A (en) | A kind of foam concrete | |
| CN111320436A (en) | Design and preparation method of carbon nanotube panel concrete mixing proportion | |
| CN107746236A (en) | A kind of preparation method of water-resistant gypsum block | |
| CN109384412A (en) | A kind of normal silicate concrete accelerant |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191021 Address after: 515000 Shanjie Lugou South Industrial Zone, Jinping District, Shantou City, Guangdong Province (Jiudou Nei) Applicant after: Guangdong Huiqiang Admixture Co., Ltd. Address before: 256600, Shandong province Binzhou City Waterfront City West office, Cui Village Committee hospital Applicant before: Shandong Bo Intelligent Technology Co., Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |