CN103553480B - A kind of A1 level Fireproof thermal insulation mortar and preparation method thereof - Google Patents
A kind of A1 level Fireproof thermal insulation mortar and preparation method thereof Download PDFInfo
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- CN103553480B CN103553480B CN201310455133.3A CN201310455133A CN103553480B CN 103553480 B CN103553480 B CN 103553480B CN 201310455133 A CN201310455133 A CN 201310455133A CN 103553480 B CN103553480 B CN 103553480B
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 38
- 238000009413 insulation Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims description 10
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000010455 vermiculite Substances 0.000 claims abstract description 22
- 229910052902 vermiculite Inorganic materials 0.000 claims abstract description 22
- 235000019354 vermiculite Nutrition 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 20
- 239000011398 Portland cement Substances 0.000 claims abstract description 15
- 229920002678 cellulose Polymers 0.000 claims abstract description 12
- 239000001913 cellulose Substances 0.000 claims abstract description 12
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 239000004816 latex Substances 0.000 claims abstract description 12
- 229920000126 latex Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 229920002522 Wood fibre Polymers 0.000 claims description 6
- 239000003570 air Substances 0.000 claims description 6
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- -1 fatty acid salt Chemical class 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 239000011324 bead Substances 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 4
- 239000004793 Polystyrene Substances 0.000 abstract description 2
- 239000002250 absorbent Substances 0.000 abstract description 2
- 230000032683 aging Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000006253 efflorescence Methods 0.000 abstract description 2
- 239000000796 flavoring agent Substances 0.000 abstract description 2
- 235000019634 flavors Nutrition 0.000 abstract description 2
- 239000011368 organic material Substances 0.000 abstract description 2
- 229920002223 polystyrene Polymers 0.000 abstract description 2
- 206010037844 rash Diseases 0.000 abstract description 2
- 238000003756 stirring Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 15
- 239000004794 expanded polystyrene Substances 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000001356 surgical procedure Methods 0.000 description 2
- 238000002560 therapeutic procedure Methods 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004795 extruded polystyrene foam Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Building Environments (AREA)
Abstract
A kind of A1 level Fireproof thermal insulation mortar disclosed by the invention, is prepared from by the raw material of following weight percent: ordinary Portland cement, flyash, expanded vermiculite, expanded and vitrified small ball, redispersable latex powder, fiber, ether of cellulose, air entrapment agent.The present invention adopts glass bead to be light skeletal, and be mixed with the superior expanded vermiculite of fire resistance, thermal insulation mortar aglite is dry mixed relative to use pearlstone and granular polystyrene, overcome the easy efflorescence of pearlstone water-absorbent great ﹑, in slip stirs, volumetric shrinkage is large, easily cause the phenomenons such as the low and hollowing cracking of product later strength, compensate for EPS again simultaneously, the organic materials Yi Ran ﹑ fire resistances such as XPS are poor, high temperature produce obnoxious flavour and ageing-resistant weathering resistance Di ﹑ construct in the least defect such as large, improve over-all properties and the workability of thermal insulation mortar.What really achieve on foundation for security is energy-conservation, comfortable, realizes the harmony of building, man and nature three.
Description
Technical field
The invention belongs to energy-saving building materials technical field, particularly a kind of A1 level Fireproof thermal insulation mortar and preparation method thereof.
Background technology
Building exterior wall heat preserving obtains wide popularization and application in China in recent years, but owing to using flammable organic heat-insulating sheet material in a large number, cause many exterior wall fire failures, comprise ring International Square in Nanjing, Harbin longitude and latitude 360 degree of Gemini mansions, the Olympic Sports Center, Jinan, attached cultural center, Beijing CCTV new address, teacher apartment, Jiangzhou, Shanghai, Shenyang feudal dynasty ten thousand prosperous mansion etc., the material that catches fire of these fire is all external-wall heat-insulation material.These fire failures cause the attention [1] of the people to external wall Surgery therapy fire resistance.
In order to the relevant requirements of further clear and definite covil construction heat insulating material for external fire supervision management, the Ministry of Public Security has issued No. 65 literary compositions on March 14th, 2011, and the energy-saving material that clear stipulaties covil construction use must reach A level and not fire [2].
Only only focus on energy-conservation for the material of exterior-wall heat insulation in the market and have ignored its fire savety, especially organic insulation material, troubling especially in use.
At present, conventional heat-insulation material mainly contains: EPS, XPS, rock wool, glass wool, expansion vitrification bead heat-preserving slurry composite heat-isolating silicate mortar etc.
1, EPS thermal conductivity 0.041w/ (mK), be take polystyrene resin as main raw material, the inside of making through foaming agent foam has the material of countless closed porosity.It has that thermal conductivity is little, water-intake rate is low, sound-proofing properties is good, physical strength and dimensional precision high, and the advantage such as even structure, in external-wall heat-insulation material market, occupation rate is high; EPS is all made up of carbon hydrogen element, and very easily burn without fire-retardant finish in essence, oxygen index is only 18%, and during burning, Heat liberation unit is comparatively large, generates a large amount of cigarette simultaneously.
2, XPS has the characteristic that intensity is large, hardness is large, thermal conductivity is little, water-intake rate is little, water vapour is little by coefficient and surfacing is fine and close, it possesses the advantage close with EPS, at present energy-conservation 65% prerequisite under, it is the first-selected thermal insulation layer material of outer heat preservation system, but shortcoming is also the drip melt that easily catches fire, when causing working-yard presence of fire and burn, more toxic gases can be produced.
3, rock wool, glass wool and general expansion vitrification bead heat-preserving slurry etc., belong to non-combustible material, self there is not fire safety problem, but its density is general comparatively large, therefore performance can not meet Surgery therapy requirement completely.And the poor thermal insulation property such as rock wool, glass wool, floor space is large, impact resistance and compressive strength poor, water absorbability is large, and environmental-protecting performance is poor, harmful in construction and application, therefore, such lagging material is used for the place that equipment pipe is incubated and personnel should not touch.
The performance index of current thermal insulation mortar are in table 1:
Summary of the invention
One of technical problem to be solved by this invention is that the material fire resistance for existing exterior-wall heat insulation is not good and provides a kind of A1 level Fireproof thermal insulation mortar.
Two of technical problem to be solved by this invention is the preparation method providing above-mentioned A1 level Fireproof thermal insulation mortar.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
A kind of A1 level Fireproof thermal insulation mortar, is prepared from by the raw material of following weight percent:
In a preferred embodiment of the invention, described expanded vermiculite unit weight is at 50 ~ 200kg/m
3between.
In a preferred embodiment of the present invention, the particle unit weight of described expanded and vitrified small ball is 50 ~ 100kg/m
3, thermal conductivity is 0.028 ~ 0.048W/mK.
In a preferred embodiment of the present invention, described fiber is selected from wood fibre or PP fiber.Wherein the length of fiber is 6 ~ 10mm.
In a preferred embodiment of the present invention, described air entrapment agent is selected from one or more in fatty acid salt or silicoorganic compound class.
The preparation method of above-mentioned A1 level Fireproof thermal insulation mortar is: after weighing by weight proportion; ordinary Portland cement, flyash, expanded vermiculite are mixed by Agravicmixer with the redispersable latex powder mixed in advance, ether of cellulose, fiber, air entrapment agent; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
In the present invention, each raw material role in A1 level Fireproof thermal insulation mortar is as follows:
Ordinary Portland cement, main inorganic coagulation material, with water generation hydration reaction, by glass bead and other material cemented together, formed uniform sizing material.Produce certain ultimate compression strength and tensile bond strength simultaneously, ensure that mortar and metope, roofing bond firmly.
Flyash is adulterant, can promote the raising of mortar ultimate compression strength and tensile bond strength with cement mixing.
Expanded vermiculite be fabric and raw-vermiculite sheet through high-temperature roasting volume energy expansion decades of times gained, be laminate structure, interlayer contains crystal water, and unit weight is at 50-200kg/m
3, thermal conductivity is little, is good lagging material, can the high temperature of resistance to 1100 DEG C.In addition, expanded vermiculite has good electrical insulating property.
Expanded and vitrified small ball is a kind of light heat-insulating material of pure inorganic non-combustible, and Nei portion Duo Kong ﹑ surface vitreous is closed, the thin footpath particle in spherule.Main chemical is Si0
2﹑ AI
20
3﹑ CaO, particle unit weight is 50 ~ 100kg/m
3, thermal conductivity is 0.028 ~ 0.048W/mK, can resistance to 1200 DEG C of high temperature, does not burn.With glass bead as aglite, the heat-insulating property of mortar can be improved, reduce material linear shrinkage, improve product over-all properties.
Redispersable latex powder is organic gel gel material, be spiked in thermal insulation mortar, can obviously improve thermal insulation mortar cohesiveness and water-retentivity, improve the cohesive force between light skeletal and cement slurry, significantly improve thermal insulation mortar workability, improve thermal insulation mortar construction effect and operating efficiency, improve thermal insulation mortar ultimate compression strength, folding strength and cohesive strength; Reduce thermal insulation mortar drying shrinkage.
Fiber mixes with cement, light skeletal etc., can the toughness of reinforced mortar, reduces dry shrinkage, increases the internal stress of mortar, improve splitting resistance.
Ether of cellulose is a kind of water-holding agent, can significantly improve thermal insulation mortar serviceability, reduces thermal insulation mortar delamination degree; Also thermal insulation mortar drying shrinkage be can reduce, thermal insulation mortar cohesive strength, coefficient of softening etc. improved.
Air entrapment agent can introduce a large amount of bubbles in thermal insulation mortar, improves thermal insulation mortar workability, reduces apparent density and the thermal conductivity of thermal insulation mortar, improves thermal insulation mortar thermal property.
Owing to have employed technical scheme as above, A1 level Fireproof thermal insulation mortar of the present invention is the power conservation requirement that a kind of thermal conductivity meets country 65%, and fire resistance reaches the vitrified microbead inorganic heat preservation mortar that A1 level is not fired.
The present invention adopts glass bead to be light skeletal, and be mixed with the superior expanded vermiculite of fire resistance, thermal insulation mortar aglite is dry mixed relative to use pearlstone and granular polystyrene, overcome the easy efflorescence of pearlstone water-absorbent great ﹑, in slip stirs, volumetric shrinkage is large, easily cause the phenomenons such as the low and hollowing cracking of product later strength, compensate for EPS again simultaneously, the organic materials Yi Ran ﹑ fire resistances such as XPS are poor, high temperature produce obnoxious flavour and ageing-resistant weathering resistance Di ﹑ construct in the least defect such as large, improve over-all properties and the workability of thermal insulation mortar.What really achieve on foundation for security is energy-conservation, comfortable, realizes the harmony of building, man and nature three.
Embodiment
Embodiment 1:
Ordinary Portland cement 33.5%, flyash 5.2%, expanded vermiculite 17.38%, expanded and vitrified small ball 41.5%, fiber 0.18%, redispersable latex powder 1.6%, ether of cellulose 0.56%, air entrapment agent 0.08%.
The label of ordinary Portland cement is P.O42.5, and expanded vermiculite unit weight is 100kg/m
3, the unit weight of expanded and vitrified small ball is 80kg/m
3, thermal conductivity is 0.042W/mK.Fiber is wood fibre, and length is 10mm, and air entrapment agent is fatty acid salt air entrapment agent.
Its preparation method is as follows:
After weighing by weight proportion; redispersable latex powder, ether of cellulose, fiber, air entrapment agent etc. that ordinary Portland cement, flyash, expanded vermiculite get togather with premix are mixed by Agravicmixer; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
It is as shown in table 2 that the results of property obtained is tested in working-yard sampling detection.
Embodiment 2:
Ordinary Portland cement 38.2%, flyash 7.2%, expanded vermiculite 15.62%, expanded and vitrified small ball 37.1%, fiber 0.16%, redispersable latex powder 1.2%, ether of cellulose 0.46%, air entrapment agent 0.06%.
The label of ordinary Portland cement is P.O42.5, and expanded vermiculite unit weight is 100kg/m
3, the unit weight of expanded and vitrified small ball is 80kg/m
3, thermal conductivity is 0.042W/mK.Fiber is wood fibre, and length is 10mm, and air entrapment agent is fatty acid salt air entrapment agent.
Its preparation method is as follows:
After weighing by weight proportion; redispersable latex powder, ether of cellulose, fiber, air entrapment agent etc. that ordinary Portland cement, flyash, expanded vermiculite get togather with premix are mixed by Agravicmixer; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
It is as shown in table 2 that the results of property obtained is tested in working-yard sampling detection.
Embodiment 3:
Ordinary Portland cement 41.1%, flyash 8.2%, expanded vermiculite 19.06%, expanded and vitrified small ball 30.2%, fiber 0.14%, redispersable latex powder 0.9%, ether of cellulose 0.36%, air entrapment agent: 0.04%.
The label of ordinary Portland cement is P.O42.5, and expanded vermiculite unit weight is 100kg/m
3, the unit weight of expanded and vitrified small ball is 80kg/m
3, thermal conductivity is 0.042W/mK.Fiber is wood fibre, and length is 10mm, and air entrapment agent is fatty acid salt air entrapment agent.
Its preparation method is as follows:
After weighing by weight proportion; redispersable latex powder, ether of cellulose, fiber, air entrapment agent etc. that common acid salt cement, flyash, expanded vermiculite get togather with premix are mixed by Agravicmixer; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
It is as shown in table 2 that the results of property obtained is tested in working-yard sampling detection.
Embodiment 4:
Ordinary Portland cement 47.1%, flyash 9.2%, expanded vermiculite 16.60%, expanded and vitrified small ball 26.1%, fiber 0.12%, redispersable latex powder 0.6%, ether of cellulose 0.26%, air entrapment agent 0.02%.
The label of ordinary Portland cement is P.O42.5, and expanded vermiculite unit weight is 100kg/m
3, the unit weight of expanded and vitrified small ball is 80kg/m
3, thermal conductivity is 0.042W/mK.Fiber is wood fibre, and length is 10mm, and air entrapment agent is fatty acid salt air entrapment agent.
Its preparation method is as follows:
After weighing by weight proportion; redispersable latex powder, ether of cellulose, fiber, air entrapment agent etc. that ordinary Portland cement, flyash, expanded vermiculite get togather with premix are mixed by Agravicmixer; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
It is as shown in table 2 that the results of property obtained is tested in working-yard sampling detection.
Table 2
Reference:
[1] Ou Zhihua, Ma Baoguo, not smoothgoing guard etc. External Thermal Insulation System fp principle and thought [J]. fire science and technology, 2010,29 (4): 282-283,287.
[2] Jiang Yan. the combustionproperty of external wall outer insulation material and the enforcement of grade scale are probed into [J]. quality and stdn, 2012, (4): 35-38..
Claims (2)
1. an A1 level Fireproof thermal insulation mortar, is characterized in that, is prepared from by the raw material of following weight percent:
Described expanded vermiculite unit weight is at 50 ~ 200kg/m
3between; The particle unit weight of described expanded and vitrified small ball is 50 ~ 100kg/m
3, thermal conductivity is 0.028 ~ 0.048W/mK; Described fiber is selected from wood fibre, and length is 6mm; Described air entrapment agent is selected from fatty acid salt air entrapment agent.
2. the preparation method of A1 level Fireproof thermal insulation mortar according to claim 1; it is characterized in that: after weighing by weight proportion; ordinary Portland cement, flyash, expanded vermiculite are mixed by Agravicmixer with the redispersable latex powder mixed in advance, ether of cellulose, fiber, air entrapment agent; add expanded and vitrified small ball to be again mixed to evenly, obtain desired product.
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| CN201310455133.3A CN103553480B (en) | 2013-09-27 | 2013-09-27 | A kind of A1 level Fireproof thermal insulation mortar and preparation method thereof |
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|---|---|---|---|
| CN201310455133.3A CN103553480B (en) | 2013-09-27 | 2013-09-27 | A kind of A1 level Fireproof thermal insulation mortar and preparation method thereof |
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| CN103553480A CN103553480A (en) | 2014-02-05 |
| CN103553480B true CN103553480B (en) | 2016-02-24 |
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| CN104211348B (en) * | 2014-08-04 | 2016-07-20 | 马鞍山科信网络科技有限公司 | A kind of anti-freezing and heat-insulating mortar and preparation method thereof |
| CN104944884A (en) * | 2015-06-29 | 2015-09-30 | 任新年 | Anti-cracking thermal insulation mortar and preparation method thereof |
| CN105016681A (en) * | 2015-07-10 | 2015-11-04 | 苏州科淼新材料有限公司 | Heat-isolating and insulating building composite material |
| CN105060826B (en) * | 2015-08-11 | 2017-01-25 | 东莞市泰丰钢结构有限公司 | Thermal insulation mortar for building external walls and preparation method thereof |
| CN105837121A (en) * | 2016-04-19 | 2016-08-10 | 金华市奥菲建材有限公司 | Inorganic vitrified-bead environment-friendly mortar, and preparation and application methods thereof |
| CN106187300A (en) * | 2016-07-18 | 2016-12-07 | 柳州弘蓝科技有限公司 | A kind of preparation method of energy saving building outer wall thermal insulation building block |
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| CN111620625A (en) * | 2020-05-28 | 2020-09-04 | 广东复特新型材料科技有限公司 | Compression-resistant heat-insulation mortar without hollowing |
| CN112209738A (en) * | 2020-10-26 | 2021-01-12 | 江苏乐通彩业新型建材有限公司 | Production method of thermal insulation mortar |
| CN112479639B (en) * | 2020-11-19 | 2022-12-02 | 桂林理工大学 | Low-shrinkage vitrified micro-bead thermal insulation mortar and preparation method thereof |
| CN112430045A (en) * | 2020-12-23 | 2021-03-02 | 湖州良柏新材料科技有限公司 | Strong waterproof flame-retardant dry-mixed mortar and preparation method thereof |
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| CN113860817B (en) * | 2021-10-14 | 2022-08-12 | 成都虹润制漆有限公司 | High-molecular polymer material for external wall insulation |
| CN114276037A (en) * | 2021-12-08 | 2022-04-05 | 重庆重通成飞新材料有限公司 | Testing method for manufacturing thermal insulation mortar by using PVC (polyvinyl chloride) recycled wind power blade |
| CN117263606B (en) * | 2023-09-20 | 2024-04-16 | 湘西宏远新型建材有限公司 | Thermal insulation type dry-mixed mortar and preparation method thereof |
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| CN201659629U (en) * | 2010-04-27 | 2010-12-01 | 成都常源机械设备有限公司 | Glazed hollow bead waterproof heat insulation sand pulp mixing machine |
| CN103011719A (en) * | 2012-11-16 | 2013-04-03 | 合肥神舟建筑工程有限公司 | Modified nano-vermiculite powder inorganic thermal-insulation mortar coated with plant ash and preparation method thereof |
-
2013
- 2013-09-27 CN CN201310455133.3A patent/CN103553480B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201659629U (en) * | 2010-04-27 | 2010-12-01 | 成都常源机械设备有限公司 | Glazed hollow bead waterproof heat insulation sand pulp mixing machine |
| CN103011719A (en) * | 2012-11-16 | 2013-04-03 | 合肥神舟建筑工程有限公司 | Modified nano-vermiculite powder inorganic thermal-insulation mortar coated with plant ash and preparation method thereof |
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| CN103553480A (en) | 2014-02-05 |
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