CN110655345A - Modified hydroxypropyl methyl cellulose ether dry powder - Google Patents
Modified hydroxypropyl methyl cellulose ether dry powder Download PDFInfo
- Publication number
- CN110655345A CN110655345A CN201911009041.6A CN201911009041A CN110655345A CN 110655345 A CN110655345 A CN 110655345A CN 201911009041 A CN201911009041 A CN 201911009041A CN 110655345 A CN110655345 A CN 110655345A
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- China
- Prior art keywords
- methyl cellulose
- mortar
- cellulose ether
- hydroxypropyl methyl
- dry powder
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/46—Water-loss or fluid-loss reducers, hygroscopic or hydrophilic agents, water retention agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a modified hydroxypropyl methyl cellulose ether dry powder which comprises 870 ~ 940 parts by weight of hydroxypropyl methyl cellulose ether, 38 ~ 70 parts by weight of polyvinyl alcohol, 10 ~ 23 parts by weight of polyacrylamide, 10 ~ 20 parts by weight of white carbon black, 5 ~ 18 parts by weight of polycarboxylic acid water reducing agent and 5 ~ 15 parts by weight of hydroxypropyl starch ether.
Description
Technical Field
The invention relates to a modified hydroxypropyl methyl cellulose ether dry powder for mortar, in particular to a modified hydroxypropyl methyl cellulose ether dry powder for external wall thermal insulation plastering mortar.
Background
In recent years, with the vigorous promotion of building energy conservation in China, a large number of quality problems appear in an external wall heat-insulation system of plastering mortar processed by utilizing traditional hydroxypropyl methyl cellulose ether, particularly, the phenomena of poor early strength, pulverization and cracking on the surface of the mortar and the like are serious due to poor mortar water retention rate and insufficient hydration reaction. The quality problem is obviously improved by the plastering mortar processed by the modified hydroxypropyl methyl cellulose ether.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the modified hydroxypropyl methyl cellulose ether dry powder which can obviously improve the water retention of the external wall thermal insulation plastering mortar, has high early strength, and does not have pulverization and cracking.
According to the technical scheme provided by the invention, the modified hydroxypropyl methyl cellulose ether dry powder comprises the following components: 870-940 parts by weight of hydroxypropyl methyl cellulose ether, 38-70 parts by weight of polyvinyl alcohol, 10-23 parts by weight of polyacrylamide, 10-20 parts by weight of white carbon black, 5-18 parts by weight of polycarboxylic acid water reducing agent and 5-15 parts by weight of hydroxypropyl starch ether.
Preferably, the method comprises the following steps: the ash content of the hydroxypropyl methyl cellulose ether is within 5wt%, and the content of methoxyl is 19-32 wt%.
Preferably, the method comprises the following steps: the mesh number of the polyvinyl alcohol is 100-200.
Preferably, the method comprises the following steps: the polyacrylamide is anionic, and the molecular weight of the polyacrylamide is more than 200 ten thousand.
Preferably, the method comprises the following steps: the specific surface area of the white carbon black is 170-230 g/m2。
Preferably, the method comprises the following steps: the solid content of the polycarboxylate superplasticizer is 97-99 wt%.
Preferably, the method comprises the following steps: the hydroxypropyl content in the hydroxypropyl starch ether is more than or equal to 20 wt%.
Compared with the traditional hydroxypropyl methyl cellulose ether, the external thermal insulation plastering mortar prepared by using the modified hydroxypropyl methyl cellulose ether dry material has the advantages of high water retention rate, high early strength, no chalking phenomenon and no cracking.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The hydroxypropyl methylcellulose ether used in the examples below is available from Sorbus technologies, Inc. of Nanjing under the type ES 7710.
The polyvinyl alcohol used in the following examples is supplied by Colorado, Japan, under the type PVA 224.
The following examples use polyacrylamide available from Nanjing Subao science and technology, Inc. under the type number: ES 7780.
The white carbon black used in the following examples is provided by Jiangxi black cat carbon black GmbH, and is produced by adopting a gas phase method process, and the model number of the white carbon black is HM-200.
The polycarboxylate water reducing agent used in the following examples is provided by Nanjing Subao science and technology Co., Ltd, and is produced by a monomer direct copolymerization process, and the type number of the polycarboxylate water reducing agent is as follows: ES 7630.
The hydroxypropyl starch ethers used in the following examples are available from Shandong light science and technology development Inc., under the type designations: building material grade.
Example 1
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
865kg of hydroxypropyl methyl cellulose ether, 67kg of polyvinyl alcohol, 20kg of anionic polyacrylamide, 19kg of white carbon black, 15kg of polycarboxylic acid water reducing agent and 14kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The performance parameters of the mortar prepared according to the mixture ratio are shown in Table 1.
TABLE 1
Example 2
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
875kg of hydroxypropyl methyl cellulose ether, 65kg of polyvinyl alcohol, 17kg of anionic polyacrylamide, 18kg of white carbon black, 12kg of polycarboxylic acid water reducing agent and 13kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The performance parameters of the mortar prepared according to the mixture ratio are shown in Table 2.
TABLE 2
Example 3
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
886kg of hydroxypropyl methyl cellulose ether, 61kg of polyvinyl alcohol, 16kg of anionic polyacrylamide, 17kg of white carbon black, 10kg of polycarboxylic acid water reducing agent and 10kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The performance parameters of the mortar prepared according to the mixture ratio are shown in Table 3.
TABLE 3
Example 4
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
896kg of hydroxypropyl methyl cellulose ether, 56kg of polyvinyl alcohol, 15kg of anionic polyacrylamide, 16kg of white carbon black, 9kg of polycarboxylic acid water reducing agent and 8kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The performance parameters of the mortar prepared according to the mixture ratio are shown in Table 4.
TABLE 4
Example 5
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
907kg of hydroxypropyl methyl cellulose ether, 49kg of polyvinyl alcohol, 14kg of anionic polyacrylamide, 15kg of white carbon black, 8kg of polycarboxylic acid water reducing agent and 7kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The mortar prepared according to the mixture ratio has the performance parameters shown in Table 5.
TABLE 5
Example 6
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
918kg of hydroxypropyl methyl cellulose ether, 43kg of polyvinyl alcohol, 12kg of anionic polyacrylamide, 14kg of white carbon black, 7kg of polycarboxylic acid water reducing agent and 6kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The mortar performance parameters prepared according to the mixture ratio are shown in Table 6.
TABLE 6
Example 7
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
924kg of hydroxypropyl methyl cellulose ether, 41kg of polyvinyl alcohol, 11kg of anionic polyacrylamide, 13kg of white carbon black, 6kg of polycarboxylic acid water reducing agent and 5kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The mortar performance parameters prepared according to the mixture ratio are shown in Table 7.
TABLE 7
Example 8
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
870kg of hydroxypropyl methyl cellulose ether, 70kg of polyvinyl alcohol, 10kg of anionic polyacrylamide, 20kg of white carbon black, 5kg of polycarboxylic acid water reducing agent and 15kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The mortar performance parameters prepared according to the mixture ratio are shown in Table 8.
TABLE 8
Example 9
The modified hydroxypropyl methyl cellulose ether dry material comprises the following components:
940kg of hydroxypropyl methyl cellulose ether, 38kg of polyvinyl alcohol, 23kg of anionic polyacrylamide, 10kg of white carbon black, 18kg of polycarboxylic acid water reducing agent and 9kg of hydroxypropyl starch ether.
All the materials are put into a V-shaped three-dimensional stirrer and are fully stirred for 90 minutes, and 3kg of modified hydroxypropyl methyl cellulose ether dry material is taken for standby.
Preparing standard dry powder mortar:
350kg of No. 42.5 ordinary portland cement; 615kg of quartz sand with 40-70 meshes and 2kg of polypropylene short fiber with 3-6 mm; 30kg of redispersible latex powder and 3kg of modified hydroxypropyl methyl cellulose ether dry material are put into a mortar stirrer to be fully stirred for 30 minutes to prepare standard dry powder mortar, namely the external thermal insulation plastering dry powder mortar for the external wall.
The standard dry powder mortar is added with 210-230kg of water and uniformly stirred to obtain the external thermal insulation plastering mortar for the external wall, and the mortar is directly scraped on various thermal insulation boards to play a role in protecting the thermal insulation layer. The mortar performance parameters prepared according to the mixture ratio are shown in Table 9.
TABLE 9
The invention adopts hydroxypropyl methyl cellulose ether: the water-soluble polymer increases the viscosity and water-retaining property of the mortar, promotes the hydration reaction of cement and increases the strength of the mortar.
The invention adopts polyvinyl alcohol: after being dissolved in water, the mortar has strong binding power, increases the activity of cement, increases the cohesive force of mortar, thereby increasing the wear resistance and reducing the chalking phenomenon.
The invention adopts anionic polyacrylamide: the water-soluble polymer has a large molecular weight, and can increase the viscosity and the water retention of the mortar. The modified mortar is matched with hydroxypropyl methyl cellulose ether and polyvinyl alcohol together for use, and can realize synergistic superposition effect, so that the water retention rate of the mortar is greatly improved, the cement hydration reaction is sufficient, the linear shrinkage rate is reduced, the cohesion, the wear resistance and the strength are greatly improved, and the pulverization and cracking phenomena on the surface of the mortar are reduced.
The invention adopts white carbon black: the anticaking agent avoids the caking of each component and increases the fluidity; small grain size, large specific surface area, and can also increase the compactness of the mortar and improve the strength.
The invention adopts polycarboxylic acid water reducing agent: the water requirement of the mortar is reduced, and the strength and the workability of the mortar are improved.
The invention adopts hydroxypropyl starch ether: the water-soluble polymer increases the water retention rate, the workability and the fluidity of the mortar.
The materials are combined according to corresponding proportion to form the modified hydroxypropyl methyl cellulose ether dry material. When the adhesive is added into mortar, the adhesive strength between the plastering mortar and the insulation board can be obviously improved, the early strength and the water retention rate of the mortar are obviously improved, no pulverization site exists, and the surface of the mortar is not cracked.
Claims (7)
1. The modified hydroxypropyl methyl cellulose ether dry powder is characterized by comprising 870 ~ 940 parts by weight of hydroxypropyl methyl cellulose ether, 38 ~ 70 parts by weight of polyvinyl alcohol, 10 ~ 23 parts by weight of polyacrylamide, 10 ~ 20 parts by weight of white carbon black, 5 ~ 18 parts by weight of polycarboxylic acid water reducing agent and 5 ~ 15 parts by weight of hydroxypropyl starch ether.
2. The dry powder of modified hydroxypropyl methylcellulose ether of claim 1 wherein the hydroxypropyl methylcellulose ether has an ash content of up to 5 wt.% and a methoxyl content of 19 wt.% ~ 32 wt.%.
3. The dry modified hydroxypropyl methyl cellulose ether powder of claim 1 wherein the polyvinyl alcohol has a mesh number of 100 ~ 200.
4. The dry modified hydroxypropyl methylcellulose ether powder of claim 1 characterized by: the polyacrylamide is anionic, and the molecular weight of the polyacrylamide is more than 200 ten thousand.
5. The modified hydroxypropyl methyl cellulose ether dry powder of claim 1, wherein the white carbon black has a specific surface area of 170 ~ 230g/m2。
6. The dry modified hydroxypropyl methyl cellulose ether powder of claim 1, wherein the solids content of the polycarboxylate superplasticizer is 97wt% ~ 99 wt%.
7. The dry modified hydroxypropyl methylcellulose ether powder of claim 1 characterized by: the hydroxypropyl content in the hydroxypropyl starch ether is more than or equal to 20 wt%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911009041.6A CN110655345A (en) | 2019-10-23 | 2019-10-23 | Modified hydroxypropyl methyl cellulose ether dry powder |
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| CN201911009041.6A CN110655345A (en) | 2019-10-23 | 2019-10-23 | Modified hydroxypropyl methyl cellulose ether dry powder |
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| CN110655345A true CN110655345A (en) | 2020-01-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115677307A (en) * | 2022-10-31 | 2023-02-03 | 江苏兆佳建材科技有限公司 | Gypsum-based self-leveling mortar and preparation method thereof |
| CN117585947A (en) * | 2023-11-28 | 2024-02-23 | 山东惠广科技发展有限公司 | A kind of building insulation mortar formula and testing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105819732A (en) * | 2016-03-17 | 2016-08-03 | 李金平 | Water-retaining agent dedicated for thermal insulation mortar |
| CN106007460A (en) * | 2016-05-27 | 2016-10-12 | 广东龙湖科技股份有限公司 | Anti-sagging agent for ceramic tile binders |
| CA2743556C (en) * | 2008-11-14 | 2017-02-28 | Lafarge | Use of at least one cellulose ether for reducing plastic shrinkage and/or plastic cracking in concrete |
| CN107573539A (en) * | 2017-07-31 | 2018-01-12 | 苏州赛璐泰科化工有限公司 | A kind of modified cellulose ethers for lifting the glue for tile open hour |
-
2019
- 2019-10-23 CN CN201911009041.6A patent/CN110655345A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2743556C (en) * | 2008-11-14 | 2017-02-28 | Lafarge | Use of at least one cellulose ether for reducing plastic shrinkage and/or plastic cracking in concrete |
| CN105819732A (en) * | 2016-03-17 | 2016-08-03 | 李金平 | Water-retaining agent dedicated for thermal insulation mortar |
| CN106007460A (en) * | 2016-05-27 | 2016-10-12 | 广东龙湖科技股份有限公司 | Anti-sagging agent for ceramic tile binders |
| CN107573539A (en) * | 2017-07-31 | 2018-01-12 | 苏州赛璐泰科化工有限公司 | A kind of modified cellulose ethers for lifting the glue for tile open hour |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115677307A (en) * | 2022-10-31 | 2023-02-03 | 江苏兆佳建材科技有限公司 | Gypsum-based self-leveling mortar and preparation method thereof |
| CN117585947A (en) * | 2023-11-28 | 2024-02-23 | 山东惠广科技发展有限公司 | A kind of building insulation mortar formula and testing method |
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