CN110684306A - EVA type re-dispersible latex powder and preparation method thereof - Google Patents
EVA type re-dispersible latex powder and preparation method thereof Download PDFInfo
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- CN110684306A CN110684306A CN201911044721.1A CN201911044721A CN110684306A CN 110684306 A CN110684306 A CN 110684306A CN 201911044721 A CN201911044721 A CN 201911044721A CN 110684306 A CN110684306 A CN 110684306A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
- C08J3/122—Pulverisation by spraying
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2331/00—Characterised by the use of copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, or carbonic acid, or of a haloformic acid
- C08J2331/02—Characterised by the use of omopolymers or copolymers of esters of monocarboxylic acids
- C08J2331/04—Homopolymers or copolymers of vinyl acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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Abstract
The invention discloses an EVA type re-dispersible latex powder and a preparation method thereof, which is obtained by preparing high-solid-content spray solution from EVA emulsion and protective colloid powder, carrying out spray drying at high rotating speed and adding an anti-caking agent in the spray drying process. According to the invention, by reducing the content of the protective colloid in the raw materials and adopting a spraying method with high solid content and high rotating speed, the EVA type redispersible latex powder with more uniform particles and better fluidity is prepared, and compared with the traditional process, the EVA type redispersible latex powder can save water by about 300KG per ton and save energy by about 20kgce per ton.
Description
Technical Field
The invention relates to a building material, in particular to EVA type redispersible latex powder and a preparation method thereof.
Background
The EVA type redispersible latex powder is mainly used for external thermal insulation bonding of external walls, plastering mortar, tile bonding mortar, self-leveling mortar, dry powder interfacial agent, jointing agent and the like, and has the advantages of good stability, long storage period, simple package, convenient transportation and the like.
In the production process of the conventional EVA type re-dispersible latex powder, a polyvinyl alcohol aqueous solution with the solid content of 8-10% is generally used as a protective colloid, and the protective colloid and the EVA emulsion are prepared into a spray solution with the solid content of 30-40% and then are subjected to spray drying to obtain the EVA type re-dispersible latex powder. Therefore, a large amount of water is required to be added in the preparation process, and the added water is completely evaporated in the drying process, so that a large amount of water and a large amount of energy are consumed, and the burning cost of the product is high. However, according to the existing process, if the water addition amount is insufficient, the particle uniformity of the obtained product is poor.
Disclosure of Invention
In order to avoid the defects of the prior art, the invention discloses an EVA type re-dispersible latex powder and a preparation method thereof, aiming at obtaining the EVA type re-dispersible latex powder with better performance through a formula and a process which are more water-saving and energy-saving.
In order to realize the purpose of the invention, the following technical scheme is adopted:
the invention firstly discloses EVA type redispersible latex powder which is characterized in that: the EVA type re-dispersible latex powder comprises the following raw materials in percentage by weight: 60-80% of EVA emulsion, 2-10% of protective colloid powder and 15-30% of anti-caking agent.
Further, the EVA emulsion is vinyl acetate-ethylene copolymer emulsion.
Further, the protective colloid powder is polyvinyl alcohol powder with the polymerization degree of 200-1000 and the alcoholysis degree of 80-100. The polyvinyl alcohol with low molecular weight and low polymerization degree has hydrophilicity and lipophilicity, can realize the function of an emulsifier and can be fully mixed with the emulsion. The polyvinyl alcohol has higher glass transition temperature, so the polyvinyl alcohol can provide protection for the EVA emulsion in the spray drying process, and the structure of the vinyl acetate-ethylene copolymer is prevented from being damaged by high-temperature drying.
Furthermore, the anti-caking agent is at least one of fumed silica, wollastonite powder, heavy calcium powder and talcum powder, preferably the mixture of the fumed silica and the superfine heavy calcium powder, and the hydrophobic structure of the fumed silica and the hydrophobicity of the superfine heavy calcium powder can ensure that the product cannot cake due to moisture absorption.
The preparation method of the EVA type re-dispersible latex powder comprises the following steps:
(1) dissolving polyvinyl alcohol powder in water to prepare a polyvinyl alcohol aqueous solution with the solid content of 20-30% as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 50-60%;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying;
in the spray drying process, the rotating speed of the rotary atomizer is 13000-16000 r/min, the air inlet temperature of the spray drying tower is 140-150 ℃, and the outlet temperature is 80-90 ℃;
(4) after spray drying, the EVA type redispersible latex powder is obtained after bag type centrifugation dust collection and cooling.
The invention has the beneficial effects that:
according to the invention, by reducing the content of the protective colloid in the raw materials and adopting a spraying method with high solid content and high rotating speed, the EVA type redispersible latex powder with more uniform particles and better fluidity is prepared, and compared with the traditional process, the EVA type redispersible latex powder can save water by about 300KG per ton and save energy by about 20kgce per ton.
Drawings
FIG. 1 is a particle size distribution diagram of the EVA-based redispersible latex powder obtained in example 1 of the present invention;
FIG. 2 is a particle size distribution diagram of the EVA-based redispersible latex powder obtained in example 2 of the present invention;
FIG. 3 is a particle size distribution diagram of the EVA-based redispersible latex powder obtained in example 3 of the present invention;
FIG. 4 is a particle size distribution diagram of the EVA re-dispersible latex powder of comparative example 1.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The vinyl acetate-ethylene copolymer emulsion used in the following examples was EVA1328 produced by Searnis (Nanjing) chemical Co., Ltd., which had a solid content of 60%.
The polyvinyl alcohol used in the following examples had a degree of polymerization of 400 and a degree of alcoholysis of 88% and was purchased from Anhui Uigai materials, Inc.
The anticaking agent used in the following examples was a mixture of fumed silica and heavy calcium powder in a mass ratio of 1: 5.
Example 1
The EVA type re-dispersible latex powder of the embodiment comprises the following raw materials in percentage by weight: 74% of vinyl acetate-ethylene copolymer emulsion, 8% of polyvinyl alcohol powder and 18% of anti-caking agent.
The preparation method of the EVA type redispersible latex powder of the embodiment is as follows:
(1) dissolving polyvinyl alcohol powder in water in a dissolving kettle to prepare a polyvinyl alcohol water solution with the solid content of 20 percent as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 50.21 percent;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying; in the spray drying process, the rotating speed of the rotary atomizer is 13500 r/min, the inlet air temperature of the spray drying tower is 145 ℃, and the outlet temperature is 87 ℃.
Example 2
The EVA type re-dispersible latex powder of the embodiment comprises the following raw materials in percentage by weight: 72% of vinyl acetate-ethylene copolymer emulsion, 8% of polyvinyl alcohol powder and 20% of anti-caking agent.
The preparation method of the EVA type redispersible latex powder of the embodiment is as follows:
(1) dissolving polyvinyl alcohol powder in water in a dissolving kettle to prepare a polyvinyl alcohol water solution with the solid content of 22 percent as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 51.16%;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying; in the spray drying process, the rotating speed of the rotary atomizer is 14200 rpm, the inlet air temperature of the spray drying tower is 140 ℃, and the outlet temperature is 85 ℃.
Example 3
The EVA type re-dispersible latex powder of the embodiment comprises the following raw materials in percentage by weight: 70% of vinyl acetate-ethylene copolymer emulsion, 8% of polyvinyl alcohol powder and 22% of anti-caking agent.
The preparation method of the EVA type redispersible latex powder of the embodiment is as follows:
(1) dissolving polyvinyl alcohol powder in water in a dissolving kettle to prepare a polyvinyl alcohol water solution with the solid content of 22 percent as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 50.98 percent;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying; in the spray drying process, the rotating speed of the rotary atomizer is 15000 r/min, the inlet air temperature of the spray drying tower is 140 ℃, and the outlet temperature is 86 ℃.
Comparative example 1
The EVA type re-dispersible latex powder of the comparative example comprises the following raw materials in percentage by weight: 70% of vinyl acetate-ethylene copolymer emulsion, 10% of polyvinyl alcohol powder and 20% of anti-caking agent.
The preparation method of the EVA type redispersible latex powder of the comparative example is as follows:
(1) dissolving polyvinyl alcohol powder in water in a dissolving kettle to prepare a polyvinyl alcohol water solution with the solid content of 8 percent as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 33.06%;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying; in the spray drying process, the rotating speed of the rotary atomizer is 10000 rpm, the inlet air temperature of the spray drying tower is 145 ℃, and the outlet temperature is 85 ℃.
FIGS. 1 to 4 are particle size distribution diagrams of the EVA type re-dispersible latex powders obtained in examples 1 to 3 and comparative example 1 in sequence, and it can be seen from the diagrams that the latex powder obtained by the method of the invention has more uniform particles.
The powder prepared in the above example is dispersed into emulsion when meeting water, and the bonding property is measured after film forming again, and the result is shown in table 1, which shows that the redispersible latex powder prepared by the process of the present invention still has good bonding property.
TABLE 1
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. An EVA type re-dispersible latex powder is characterized in that: the EVA type re-dispersible latex powder comprises the following raw materials in percentage by weight: 60-80% of EVA emulsion, 2-10% of protective colloid powder and 15-30% of anti-caking agent.
2. The EVA-based redispersible latex powder of claim 1, wherein: the EVA emulsion is vinyl acetate-ethylene copolymer emulsion.
3. The EVA-based redispersible latex powder of claim 1, wherein: the protective colloid powder is polyvinyl alcohol powder with the polymerization degree of 200-1000 and the alcoholysis degree of 80-100.
4. The EVA-based redispersible latex powder of claim 1, wherein: the anti-caking agent is at least one of fumed silica, wollastonite powder, heavy calcium powder and talcum powder.
5. The preparation method of the EVA type re-dispersible latex powder of any one of claims 1-4, which is characterized by comprising the following steps:
(1) dissolving polyvinyl alcohol powder in water to prepare a polyvinyl alcohol aqueous solution with the solid content of 20-30% as a protective colloid;
(2) fully stirring and mixing the protective colloid and the EVA emulsion to prepare spray liquid with the solid content of 50-60%;
(3) pumping the spray liquid into a spray drying tower for spray drying, and adding an anti-caking agent into the tower top while spray drying;
(4) after spray drying, the EVA type redispersible latex powder is obtained after bag type centrifugation dust collection and cooling.
6. The method of claim 5, wherein: in the step (3), the rotating speed of the rotary atomizer is 13000-.
7. The method of claim 5, wherein: in the step (3), the inlet air temperature of the spray drying tower is 140-150 ℃, and the outlet temperature is 80-90 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911044721.1A CN110684306A (en) | 2019-10-30 | 2019-10-30 | EVA type re-dispersible latex powder and preparation method thereof |
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| CN201911044721.1A CN110684306A (en) | 2019-10-30 | 2019-10-30 | EVA type re-dispersible latex powder and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112143149A (en) * | 2020-09-29 | 2020-12-29 | 安徽皖维高新材料股份有限公司 | Novel acrylic latex powder and preparation method thereof |
| CN112852227A (en) * | 2021-01-14 | 2021-05-28 | 佛山市凯隽新建材科技有限公司 | High-molecular polymer spraying material for tunnel waterproofing and preparation and application methods thereof |
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| CN102382407A (en) * | 2011-08-19 | 2012-03-21 | 安徽皖维高新材料股份有限公司 | Redispersible emulsion powder and preparation method thereof |
| CN102976660A (en) * | 2012-12-07 | 2013-03-20 | 天津市科垣新型建材有限公司 | Disposable disperse re-dispersible emulsion powder |
| CN105712654A (en) * | 2016-01-29 | 2016-06-29 | 保定市华联化工有限责任公司 | Re-dispersibility latex powder and preparation method thereof |
| CN108034122A (en) * | 2017-12-26 | 2018-05-15 | 江苏福吉利亚建材有限公司 | A kind of redispersable latex powder and preparation method thereof |
-
2019
- 2019-10-30 CN CN201911044721.1A patent/CN110684306A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102382407A (en) * | 2011-08-19 | 2012-03-21 | 安徽皖维高新材料股份有限公司 | Redispersible emulsion powder and preparation method thereof |
| CN102976660A (en) * | 2012-12-07 | 2013-03-20 | 天津市科垣新型建材有限公司 | Disposable disperse re-dispersible emulsion powder |
| CN105712654A (en) * | 2016-01-29 | 2016-06-29 | 保定市华联化工有限责任公司 | Re-dispersibility latex powder and preparation method thereof |
| CN108034122A (en) * | 2017-12-26 | 2018-05-15 | 江苏福吉利亚建材有限公司 | A kind of redispersable latex powder and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112143149A (en) * | 2020-09-29 | 2020-12-29 | 安徽皖维高新材料股份有限公司 | Novel acrylic latex powder and preparation method thereof |
| CN112852227A (en) * | 2021-01-14 | 2021-05-28 | 佛山市凯隽新建材科技有限公司 | High-molecular polymer spraying material for tunnel waterproofing and preparation and application methods thereof |
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Application publication date: 20200114 |