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CN101863639A - Inorganic thermal-insulation mortar used for building exterior walls of buildings and preparation method thereof - Google Patents

Inorganic thermal-insulation mortar used for building exterior walls of buildings and preparation method thereof Download PDF

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Publication number
CN101863639A
CN101863639A CN200910049325A CN200910049325A CN101863639A CN 101863639 A CN101863639 A CN 101863639A CN 200910049325 A CN200910049325 A CN 200910049325A CN 200910049325 A CN200910049325 A CN 200910049325A CN 101863639 A CN101863639 A CN 101863639A
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CN
China
Prior art keywords
weight part
insulation mortar
heat insulation
external wall
inorganic
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.)
Pending
Application number
CN200910049325A
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Chinese (zh)
Inventor
王永海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI MINJIANG TONG PRODUCT CO Ltd
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SHANGHAI MINJIANG TONG PRODUCT CO Ltd
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Priority to CN200910049325A priority Critical patent/CN101863639A/en
Publication of CN101863639A publication Critical patent/CN101863639A/en
Pending legal-status Critical Current

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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

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  • Building Environments (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention relates to inorganic thermal-insulation mortar used for building exterior walls of buildings and a preparation method thereof. The invention is characterized in that the thermal-insulation mortar comprises the following components in part by weight: lightweight aggregate 100-150, binding material 100-150, fly ash 10-60, and additive 8.72-11.36. Compared with the prior art, the inorganic thermal-insulation mortar has the advantages of high weather resistance, high aging resistance, long service life, high fireproofing and flame-retarding performance, energy conservation and environment protection.

Description

A kind of inorganic heat insulation mortar that is used for external wall and preparation method thereof
Technical field
The present invention relates to a kind of mortar for building, especially relate to a kind of inorganic heat insulation mortar that is used for external wall and preparation method thereof.
Background technology
Along with the aggravation of world energy sources crisis and the further deterioration of ecotope; China's energy and environmental issue are more outstanding because of the economy contradiction that grows continuously and fast; require external wall all will do thermal insulation layer; build heat preservation energy-saving and cause concern in the industry; big surprising of the use meeting of its lagging material, and the existing building External Walls Heating Insulation adopts polystyrene block (EPS), extruded sheet (XPS), spraying polyurethane (SPU) and adhesive polystyrene granule heat-insulating mortar.Above-mentioned lagging material is organic insulation material, and it has the advantage of light weight, good effect of heat insulation, but also has following defective:
(1) weather resistance is poor, and can wear out gradually, and work-ing life can be shorter relatively.
(2) easy firing of not preventing fires is met high temperature and can be decomposited benzene class volatile gases, easily causes people's death by suffocation.
(3) intensity is low, and ultimate compression strength is 0.1~0.2MPa only, and bearing capacity is little, and security and stability is poor.
(4) difficulty of construction is big, needs professional construction, the engineering cost height.
(5) its resource-constrained is difficult to recycle, and above-mentioned lagging material is the organic foam material of butyrous, mainly is that resources processing forms with the oil, and is difficult to the circulation comprehensive utilization.
(6) the eco-environmental prote difference is very poor, may cause new environmental issue.The wall insulating layer that the above-mentioned lagging material relevant with plastics done, run into fire or many decades after thermal insulation layer go out of use, not only be difficult to recycle, cause the great wasting of resources, and can serious environment pollution.
Summary of the invention
Purpose of the present invention be exactly provide in order to overcome the defective that above-mentioned prior art exists that a kind of good weatherability, ageing resistance are good, the inorganic heat insulation mortar that is used for external wall of long service life, fire protection flame retarding, energy-conserving and environment-protective.
Purpose of the present invention can be achieved through the following technical solutions: a kind of inorganic heat insulation mortar that is used for external wall is characterized in that this thermal insulation mortar comprises following component and content:
Light skeletal 100-150 weight part;
Matrix material 100-150 weight part;
Flyash 10-60 weight part;
Admixture 8.72-11.36 weight part.
Described light skeletal is inorganic thermal insulation material glass bead.
Described matrix material is an inorganic coagulation material cement.
Described admixture comprises redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre.
Each components contents is in the described admixture: redispersable latex powder 5-6 weight part, ether of cellulose 2-3 weight part, air entrapment agent 0.06-0.08 weight part, suds-stabilizing agent 0.06-0.08 weight part, water reducer 0.8-1.2 weight part and wood fibre 0.8-1.0 weight part.
A kind of preparation method who is used for the inorganic heat insulation mortar of external wall is characterized in that, this method may further comprise the steps:
(1) with matrix material 100-150 weight part, flyash 10-60 weight part, admixture 8.72-11.36 weight part drops into Agravicmixer, mixes 3-6min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add light skeletal 100-150 weight part, mix 1-3min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
Described light skeletal is inorganic thermal insulation material glass bead.
Described matrix material is an inorganic coagulation material cement.
Described admixture comprises redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre.
Each components contents is in the described admixture: redispersable latex powder 5-6 weight part, ether of cellulose 2-3 weight part, air entrapment agent 0.06-0.08 weight part, suds-stabilizing agent 0.06-0.08 weight part, water reducer 0.8-1.2 weight part and wood fibre 0.8-1.0 weight part.
Compared with prior art, the present invention has the following advantages:
(1) good weatherability, good, the long service life of ageing resistance
Inorganic heat insulation mortar of the present invention is made up of inorganic materials, chemical stability is good, good weatherability, be particularly suitable for the requirement of Shanghai regional architecture power-saving technology, promptly should consider Winter protection, consider that again summer is heat insulation, also will solve problems such as waterproof, mildew-resistant simultaneously. and ageing resistance is good, long service life is with the same life-span of buildings.
(2) fire protection flame retarding
Inorganic heat insulation mortar combustionproperty of the present invention is the A level, has good uninflammability, also can not decompose the generation obnoxious flavour at 1000 ℃, and its fire resistance can satisfy the requirement of body of wall energy conservation project, no longer needs to take the fireproof construction measure.
(3) the intensity height, bearing capacity is big, security and stability good
Inorganic coagulation material cement that inorganic heat insulation mortar of the present invention is used and light inorganic aggregate glass bead form good colloid skeleton, have higher intensity, and ultimate compression strength is 3~4 times of organic insulation material, up to 0.4~0.8MPa.
(4) convenient, the time and labour saving of construction
Constructional method is simple, adopts plastering technique, and is identical with the conventional cement mortar constructional method, the time and labour saving, and the interface does not have seam, effectively reduces the additional heat loss, prevents that hot and cold bridge from producing, and compares with organic insulation material, has tangible construction cost advantage.
(5) recycle, economize on resources
National resources is saved in inorganic heat insulation mortar waste of the present invention comprehensive utilization capable of circulation greatly.
(6) eco-environmental prote is good
Inorganic heat insulation mortar of the present invention is processed by natural mineral, does not harmlessly fire, and can not cause secondary pollution, and eco-environmental prote is good, is a kind of green heat preservation construction material.
(7) utilization scope is wide
Organic insulation material is inflammable, presence of fire, can cause security against fire hidden danger, government has the organic insulation material of explicit stipulation to be only applicable to building exterior wall heat preserving, can not be used for interior insulation, and the MJ thermal insulation mortar is not only applicable to external wall and is incubated outward, also is applicable to insulation and the inside and outside insulation of party wall in the external wall.
(8) cost performance height, market outlook are good
Above-mentioned thermal insulation mortar is relatively low because of material cost, tooling cost and construction cost, the cost performance height, and economic and social benefit is good, has good market outlook.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.
Embodiment 1
A kind of inorganic heat insulation mortar that is used for external wall, this thermal insulation mortar comprises following component and content:
Glass bead 100 weight parts;
Cement 150 weight parts;
Flyash 20 weight parts;
Redispersable latex powder 5 weight parts;
Ether of cellulose 2 weight parts;
Air entrapment agent 0.08 weight part;
Suds-stabilizing agent 0.08 weight part;
Water reducer 1.0 weight parts;
Wood fibre 1.0 weight parts.
Above-mentioned glass bead is a light skeletal, is a kind of inorganic thermal insulation material; Cement is matrix material, is inorganic coagulation material; Redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre are admixture, and wherein glass bead, cement, flyash and admixture are the commercially available prod, can directly buy from the market.
The above-mentioned preparation method who is used for the inorganic heat insulation mortar of external wall may further comprise the steps:
(1) according to aforementioned proportion with cement, flyash, redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre drop into Agravicmixer, mix 3min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add glass bead, mix 1min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
Embodiment 2
A kind of inorganic heat insulation mortar that is used for external wall, this thermal insulation mortar comprises following component and content:
Glass bead 120 weight parts;
Cement 130 weight parts;
Flyash 25 weight parts;
Redispersable latex powder 5.5 weight parts;
Ether of cellulose 2.5 weight parts;
Air entrapment agent 0.06 weight part;
Suds-stabilizing agent 0.06 weight part;
Water reducer 1.2 weight parts;
Wood fibre 0.8 weight part.
Above-mentioned glass bead is a light skeletal, is a kind of inorganic thermal insulation material; Cement is matrix material, is inorganic coagulation material.Redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre are admixture, and wherein glass bead, cement, flyash and admixture are the commercially available prod, can directly buy from the market.
The above-mentioned preparation method who is used for the inorganic heat insulation mortar of external wall may further comprise the steps:
(1) according to aforementioned proportion with cement, flyash, redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre drop into Agravicmixer, mix 6min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add glass bead, mix 3min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
Embodiment 3
A kind of inorganic heat insulation mortar that is used for external wall, this thermal insulation mortar comprises following component and content:
Glass bead 130 weight parts;
Cement 120 weight parts;
Flyash 23 weight parts;
Redispersable latex powder 6 weight parts;
Ether of cellulose 3.0 weight parts;
Air entrapment agent 0.07 weight part;
Suds-stabilizing agent 0.07 weight part;
Water reducer 0.8 weight part;
Wood fibre 1.0 weight parts.
Above-mentioned glass bead is a light skeletal, is a kind of inorganic thermal insulation material; Cement is matrix material, is inorganic coagulation material.Redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre are admixture, and wherein glass bead, cement, flyash and admixture are the commercially available prod, can directly buy from the market.
The above-mentioned preparation method who is used for the inorganic heat insulation mortar of external wall may further comprise the steps:
(1) according to aforementioned proportion with cement, flyash, redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre drop into Agravicmixer, mix 5min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add glass bead, mix 2min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
Embodiment 4
A kind of inorganic heat insulation mortar that is used for external wall, this thermal insulation mortar comprises following component and content:
Glass bead 150 weight parts;
Cement 100 weight parts;
Flyash 10 weight parts;
Redispersable latex powder 5 weight parts;
Ether of cellulose 2 weight parts;
Air entrapment agent 0.06 weight part;
Suds-stabilizing agent 0.06 weight part;
Water reducer 0.8 weight part;
Wood fibre 0.8 weight part.
Above-mentioned glass bead is a light skeletal, is a kind of inorganic thermal insulation material; Cement is matrix material, is inorganic coagulation material; Redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre are admixture, and wherein glass bead, cement, flyash and admixture are the commercially available prod, can directly buy from the market.
The above-mentioned preparation method who is used for the inorganic heat insulation mortar of external wall may further comprise the steps:
(1) according to aforementioned proportion with cement, flyash, redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre drop into Agravicmixer, mix 4min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add glass bead, mix 2min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
Embodiment 5
A kind of inorganic heat insulation mortar that is used for external wall, this thermal insulation mortar comprises following component and content:
Glass bead 110 weight parts;
Cement 110 weight parts;
Flyash 60 weight parts;
Redispersable latex powder 6 weight parts;
Ether of cellulose 3 weight parts;
Air entrapment agent 0.08 weight part;
Suds-stabilizing agent 0.08 weight part;
Water reducer 1.2 weight parts;
Wood fibre 1.0 weight parts.
Above-mentioned glass bead is a light skeletal, is a kind of inorganic thermal insulation material; Cement is matrix material, is inorganic coagulation material; Redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre are admixture, and wherein glass bead, cement, flyash and admixture are the commercially available prod, can directly buy from the market.
The above-mentioned preparation method who is used for the inorganic heat insulation mortar of external wall may further comprise the steps:
(1) according to aforementioned proportion with cement, flyash, redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre drop into Agravicmixer, mix 3min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add glass bead, mix 1min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.

Claims (10)

1. an inorganic heat insulation mortar that is used for external wall is characterized in that, this thermal insulation mortar comprises following component and content:
Light skeletal 100-150 weight part;
Matrix material 100-150 weight part;
Flyash 10-60 weight part;
Admixture 8.72-11.36 weight part.
2. a kind of inorganic heat insulation mortar that is used for external wall according to claim 1 is characterized in that, described light skeletal is inorganic thermal insulation material glass bead.
3. a kind of inorganic heat insulation mortar that is used for external wall according to claim 1 is characterized in that described matrix material is an inorganic coagulation material cement.
4. a kind of inorganic heat insulation mortar that is used for external wall according to claim 1 is characterized in that described admixture comprises redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre.
5. a kind of inorganic heat insulation mortar that is used for external wall according to claim 4, it is characterized in that each components contents is in the described admixture: redispersable latex powder 5-6 weight part, ether of cellulose 2-3 weight part, air entrapment agent 0.06-0.08 weight part, suds-stabilizing agent 0.06-0.08 weight part, water reducer 0.8-1.2 weight part and wood fibre 0.8-1.0 weight part.
6. preparation method who is used for the inorganic heat insulation mortar of external wall as claimed in claim 1 is characterized in that this method may further comprise the steps:
(1) with matrix material 100-150 weight part, flyash 10-60 weight part, admixture 8.72-11.36 weight part drops into Agravicmixer, mixes 3-6min;
(2) above-mentioned materials is mixed after, drop into ribbon mixer, add light skeletal 100-150 weight part, mix 1-3min, obtain dry blend;
(3) above-mentioned dry blend is dropped into the air-sweeping type wrapping machine, weighing and bagging promptly gets product.
7. a kind of preparation method who is used for the inorganic heat insulation mortar of external wall according to claim 6 is characterized in that, described light skeletal is inorganic thermal insulation material glass bead.
8. a kind of preparation method who is used for the inorganic heat insulation mortar of external wall according to claim 6 is characterized in that described matrix material is an inorganic coagulation material cement.
9. a kind of preparation method who is used for the inorganic heat insulation mortar of external wall according to claim 6 is characterized in that described admixture comprises redispersable latex powder, ether of cellulose, air entrapment agent, suds-stabilizing agent, water reducer and wood fibre.
10. a kind of preparation method who is used for the inorganic heat insulation mortar of external wall according to claim 9, it is characterized in that each components contents is in the described admixture: redispersable latex powder 5-6 weight part, ether of cellulose 2-3 weight part, air entrapment agent 0.06-0.08 weight part, suds-stabilizing agent 0.06-0.08 weight part, water reducer 0.8-1.2 weight part and wood fibre 0.8-1.0 weight part.
CN200910049325A 2009-04-15 2009-04-15 Inorganic thermal-insulation mortar used for building exterior walls of buildings and preparation method thereof Pending CN101863639A (en)

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Application Number Priority Date Filing Date Title
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102452821A (en) * 2011-03-10 2012-05-16 贵州省建筑材料科学研究设计院 Method of preparing insulation ready-mixed mortar with electrolysis manganese residue as raw material
CN102503293A (en) * 2011-09-22 2012-06-20 上海森瀚新型建材科技有限公司 Microcellular foamed modified glazed hollow bead insulating mortar and preparation method thereof
CN102674774A (en) * 2012-05-26 2012-09-19 万华节能建材股份有限公司 Elastic anti-crack coating mortar and preparation process thereof
CN102746019A (en) * 2011-07-19 2012-10-24 江苏尼高科技有限公司 High performance polymer foaming cement thermal insulation material and preparation method thereof
CN103058593A (en) * 2012-12-28 2013-04-24 嘉兴市博宏新型建材有限公司 Method for preparing common dry-mixed mortar by pulverized fuel ash and mining powder
CN103058605A (en) * 2012-12-26 2013-04-24 上海天补建筑科技有限公司 Lightweight surface mortar used for foamed cement boards and preparation method thereof
CN103058592A (en) * 2012-12-28 2013-04-24 嘉兴市博宏新型建材有限公司 Mechanically sprayed dry-mixed plastering mortar
CN103601445A (en) * 2013-11-14 2014-02-26 江苏蓝圈新材料有限公司 Hollow glazed bead thermal-insulation mortar
CN103626436A (en) * 2014-01-01 2014-03-12 安唛杰节能建材科技(上海)有限公司 Fireproof and heat-preservation mortar production process and device
CN103664078A (en) * 2013-11-26 2014-03-26 蚌埠市天网渔需用品有限公司 Fire-resistant flame-retardant composite thermal insulation mortar and preparation method thereof
CN104227573A (en) * 2014-09-29 2014-12-24 无锡阳工机械制造有限公司 Botanical metal sprayed mortar for rust removal
CN105541199A (en) * 2015-12-28 2016-05-04 太仓顺如成建筑材料有限公司 Lightweight type sound insulation building material
CN108395161A (en) * 2018-05-16 2018-08-14 合肥天沃能源科技有限公司 A kind of thermal insulation mortar and preparation method thereof for external wall
CN109250952A (en) * 2018-09-25 2019-01-22 福建三凯建筑材料有限公司 A kind of additive and mortar for mortar
CN110330288A (en) * 2019-06-12 2019-10-15 江苏洋河新城新材料有限责任公司 A kind of ground insulating mortar and preparation method thereof
CN111662060A (en) * 2020-05-14 2020-09-15 太仓佳佳建筑材料有限公司 Novel efficient vitrified micro bubble inorganic thermal insulation mortar material and preparation technology thereof

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102452821A (en) * 2011-03-10 2012-05-16 贵州省建筑材料科学研究设计院 Method of preparing insulation ready-mixed mortar with electrolysis manganese residue as raw material
CN102746019A (en) * 2011-07-19 2012-10-24 江苏尼高科技有限公司 High performance polymer foaming cement thermal insulation material and preparation method thereof
CN102503293A (en) * 2011-09-22 2012-06-20 上海森瀚新型建材科技有限公司 Microcellular foamed modified glazed hollow bead insulating mortar and preparation method thereof
CN102503293B (en) * 2011-09-22 2013-09-04 上海森瀚新型材料科技有限公司 Microcellular foamed modified glazed hollow bead insulating mortar and preparation method thereof
CN102674774A (en) * 2012-05-26 2012-09-19 万华节能建材股份有限公司 Elastic anti-crack coating mortar and preparation process thereof
CN103058605B (en) * 2012-12-26 2014-09-10 上海天补建筑科技有限公司 Lightweight surface mortar used for foamed cement boards and preparation method thereof
CN103058605A (en) * 2012-12-26 2013-04-24 上海天补建筑科技有限公司 Lightweight surface mortar used for foamed cement boards and preparation method thereof
CN103058593A (en) * 2012-12-28 2013-04-24 嘉兴市博宏新型建材有限公司 Method for preparing common dry-mixed mortar by pulverized fuel ash and mining powder
CN103058592A (en) * 2012-12-28 2013-04-24 嘉兴市博宏新型建材有限公司 Mechanically sprayed dry-mixed plastering mortar
CN103601445A (en) * 2013-11-14 2014-02-26 江苏蓝圈新材料有限公司 Hollow glazed bead thermal-insulation mortar
CN103664078A (en) * 2013-11-26 2014-03-26 蚌埠市天网渔需用品有限公司 Fire-resistant flame-retardant composite thermal insulation mortar and preparation method thereof
CN103626436A (en) * 2014-01-01 2014-03-12 安唛杰节能建材科技(上海)有限公司 Fireproof and heat-preservation mortar production process and device
CN103626436B (en) * 2014-01-01 2015-09-09 安唛杰节能建材科技(上海)有限公司 A kind of Fireproof thermal insulation mortar production technique and production equipment
CN104227573A (en) * 2014-09-29 2014-12-24 无锡阳工机械制造有限公司 Botanical metal sprayed mortar for rust removal
CN105541199A (en) * 2015-12-28 2016-05-04 太仓顺如成建筑材料有限公司 Lightweight type sound insulation building material
CN108395161A (en) * 2018-05-16 2018-08-14 合肥天沃能源科技有限公司 A kind of thermal insulation mortar and preparation method thereof for external wall
CN109250952A (en) * 2018-09-25 2019-01-22 福建三凯建筑材料有限公司 A kind of additive and mortar for mortar
CN110330288A (en) * 2019-06-12 2019-10-15 江苏洋河新城新材料有限责任公司 A kind of ground insulating mortar and preparation method thereof
CN111662060A (en) * 2020-05-14 2020-09-15 太仓佳佳建筑材料有限公司 Novel efficient vitrified micro bubble inorganic thermal insulation mortar material and preparation technology thereof

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Application publication date: 20101020