CN103396032A - Special water reducing agent for gypsum and preparation method thereof - Google Patents
Special water reducing agent for gypsum and preparation method thereof Download PDFInfo
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- CN103396032A CN103396032A CN2013103065037A CN201310306503A CN103396032A CN 103396032 A CN103396032 A CN 103396032A CN 2013103065037 A CN2013103065037 A CN 2013103065037A CN 201310306503 A CN201310306503 A CN 201310306503A CN 103396032 A CN103396032 A CN 103396032A
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Abstract
The invention discloses a special water reducing agent for gypsum. The special water reducing agent is prepared from allyl ether, acrylic acid and allyl phosphonate which are used as monomers as well as a cationic monomer, an alkali neutralizer and an initiator through copolymerization reaction. The special water reducing agent for the gypsum is high in water reducing rate, strong in delayed coagulation and good in adaptability to the gypsum, avoids formaldehyde pollution in the production process, and is particularly adaptive to building gypsum and other gypsum products.
Description
Technical field
The present invention relates to the special-purpose water reducer of a kind of gypsum, belong to chemical material for building field.
Background technology
Gypsum is as a kind of abundant non-ore resources and good process performance prosperity material contained, and its processing is simple, energy consumption is lower, has that quality is light, fast, the good characteristics such as radioactivity is supported, sound insulation, heat insulation, fire performance is good condense.
Yet for the research of the aspect of gypsum water reducer, obviously lag behind the development of cement water reducing agent, existing high-efficiency water-reducing agent of poly-carboxylic acid is because water-reducing rate is high, function of slump protection is good, gain in strength is fast, visual appearance is good, and suitable preparation is high-strength, super high strength concrete, high workability and self-compacting concrete.But gypsum is different from cement, can not indiscriminately imitate the correlative study of polycarboxylate water-reducer, because gypsum has special performance, therefore the situation that poor fluidity and intensity are not up to standard has just appearred in polycarboxylate water-reducer in application process.Traditional polycarboxylate water-reducer must be in the face of the difficult problem of gypsum to its influential effect.
For this problem, in industry, be generally by adopting polycarboxylic acids water reducing agent compositional to obtain preferably gypsum water reducer of performance in the mode of retardant at present.This composite water-reducing agent dispersiveness in earlier stage is poor, and the sensitivity suitable to the volume of retardant.Patent CN1759928 and CN1786341 disclose the aid dispersion of a kind of dispersion agent for gypsum slurry.All adopt the compound that contains the groups such as carboxylic acid group, sulfonic acid and acid amides to carry out radical polymerization and form, yet this technique needs dispersion agent and auxiliary dispersants to be used in conjunction with in application process, complex operation.
Summary of the invention
For above-mentioned defect, the invention discloses the special-purpose water reducer of a kind of gypsum, but have higher dispersion and application property, and technique is simple, pollution-free in production process.
For achieving the above object, the present invention is achieved through the following technical solutions:
The special-purpose water reducer of a kind of gypsum, take allyl ethers, vinylformic acid and allyl group phosphonic acid ester as monomer, be aided with cationic monomer, alkaline neutraliser, adds initiator to carry out copolyreaction and make.
Water reducer of the present invention, in preparation process, the consumption of water can be adjusted according to actual requirement of engineering, and preferably the solid content of this water reducer is 40%.
Water reducer of the present invention, employing adds above-mentioned each raw material to make in water, the consumption of each composition, in mass, the amount ratio of each component is allyl ethers: vinylformic acid: water: allyl group phosphonic acid ester: cationic monomer: initiator: alkaline neutraliser=1: (3.0～4.0): 200: (1.5～2.5): (1.0～1.5): (0.5～1.0): (0.4～0.8).
In the present invention, described allyl ethers preferably adopts macromolecular allyl polyether series product, include but not limited to prenol Soxylat A 25-7 TPEG, 2-methyl allyl alcohol polyoxyethylene ether HPEG, vinyl Soxylat A 25-7 VPEG, allyl polyethenoxy ether APEG etc., preferably adopt TPEG.
In the present invention, the allyl group phosphonic acid ester comprise in Dimethyl ally phosphite, allyl group diethyl phosphonate, 2-propenyl diethyl phosphonate one or more mixture, by having introduced the organic phosphoric acid molecule, participate in reaction, on molecular chain, increased a large amount of phosphonyl groups.
In the present invention, described initiator comprises one or more the mixture in hydrogen peroxide, ammonium persulphate, benzoyl peroxide, by adding initiator, induces initiated polymerization.
In the present invention, described cationic monomer comprises one or more the mixture in cation acrylamide, acryloyl dimethylamine ethyl ester, diallyl dimethylamine, by using positively charged ion, make water reducer have good dispersive ability at the gypsum that compares with traditional, and have certain slow setting constructability and carry out.
Described alkaline neutraliser comprises one or more the mixture in sodium hydroxide, potassium hydroxide, quadrol, trolamine.
In the present invention, disclosed water reducer is by on structure, having carboxylic acid, phosphoric acid, hydroxyl, polyoxyethylene groups and amino group, by the monomer polymerization of four kinds, formed, and given full play to the synergy between each composition.
Accordingly, the invention discloses the preparation method of the special-purpose water reducer of described gypsum, take allyl ethers, vinylformic acid and allyl group phosphonic acid ester as monomer, and be aided with cationic monomer, alkaline neutraliser under the temperature condition of 30-50 ℃, add initiator to carry out copolyreaction, make.
Preferably, the reaction times of described copolyreaction is 4 hours, keeps reaction yield preferably.
Compared with prior art, water reducer of the present invention has been obtained following technical progress:
1. water-reducing rate is higher, under lower volume, gypsum is had to good dispersiveness.
The gypsum slow setting time longer, and application property is better, is conducive to the construction of gypsum and the moulding of plastering.
3. the adaptability of gypsum is better, and the common gypsum of each department is all had to good dispersive ability.
4. pollution-free in production process, belong to environmentfriendly products.
Embodiment
Embodiment 1
By allyl polyether TPEG: vinylformic acid: water: Dimethyl ally phosphite: acryloyl diformazan ammonia ethyl ester: initiator: sodium hydroxide=1: 4: 200: 1.5: 1.2: 0.6: 0.55: (each component all in molar ratio) feeds intake, be warming up to 45 ℃, through copolyreaction, after reaction in 4 hours, obtain the transparent liquid of light yellow thickness, obtain the special-purpose water reducer of gypsum of solid content 40%.
Embodiment 2
By allyl polyether TPEG: vinylformic acid: water: allyl group diethyl phosphonate: acrylamide: initiator: potassium hydroxide=1: 4: 200: 2.0: 1.2: 0.6: 0.45 (each component all in molar ratio) feeds intake, be warming up to 45 ℃, through copolyreaction, after reaction in 4 hours, obtain the transparent liquid of light yellow thickness, obtain the special-purpose water reducer of gypsum of solid content 40%.
Embodiment 3
By allyl polyether TPEG: vinylformic acid: water: 2-propenyl diethyl phosphonate: diallyl dimethylamine: initiator: quadrol=1: 4: 200: 1.5: 1.5: 0.6: 0.25 (each component all in molar ratio) feeds intake, be warming up to 45 ℃, through copolyreaction, after reaction in 4 hours, obtain the transparent liquid of light yellow thickness, obtain the special-purpose water reducer of gypsum of solid content 40%.
In order to estimate the dispersing property of the special-purpose Water-reducing Admixtures To Cements of gypsum of the present invention, plaster of Paris degree of mobilization, standard consistency are measured and are carried out with reference to GB9776-88 " plaster of Paris ".
Slump test is as follows: pour 125g water and quantitative water reducer into stirrer for mixing even, in 5s, add plaster of Paris 200g, mix stirs 35s and obtains gypsum slurry.Then in rapid injection ring mould cylinder, with scraper, scrape off the slurry that overflows, mention rapidly ring mould (desulfurated plaster contacts with water and starts to complete in 50s).Measure the pulp flow degree.
Experimental result sees the following form shown in 1.
The plaster of Paris slurry degree of mobilization experiment of the special-purpose water reducer of table 1 gypsum
| Sample number into spectrum | The solid volume of folding | Pulp flow degree/mm | Presetting period/s | Final setting time/s |
| Blank | 0 | 165 | 95 | 390 |
| Embodiment 1 | 0.05％ | 240 | 185 | 790 |
| Embodiment 2 | 0.05％ | 265 | 190 | 800 |
| Embodiment 3 | 0.05％ | 250 | 195 | 805 |
| Commercially available PC | 0.05％ | 155 | 125 | 420 |
By above-mentioned visible, with polycarboxylate water-reducer, to compare, the special-purpose water reducer of gypsum of the present invention, improved the water-reducing rate of water reducer, and produced formaldehydeless pollution, belongs to environmentfriendly products.The special-purpose water reducer of gypsum that is prepared by present method has excellent dispersing property and slow setting to gypsum, and better to the adaptability of gypsum than the common polycarboxylate water-reducer of commercially available PC.
Claims (10)
1. the special-purpose water reducer of gypsum, is characterized in that being aided with cationic monomer, alkaline neutraliser take allyl ethers, vinylformic acid and allyl group phosphonic acid ester as monomer, adds initiator to carry out copolyreaction and make.
2. the special-purpose water reducer of gypsum according to claim 1, is characterized in that its solid content is 40%.
3. the special-purpose water reducer of gypsum according to claim 1, the amount ratio that it is characterized in that each component is allyl ethers: vinylformic acid: water: allyl group phosphonic acid ester: cationic monomer: initiator: alkaline neutraliser=1: (3.0～4.0): 200: (1.5～2.5): (1.0～1.5): (0.5～1.0): (0.4～0.8).
4. the special-purpose water reducer of gypsum according to claim 1, is characterized in that described allyl ethers is allyl polyether.
5. the special-purpose water reducer of gypsum according to claim 1, it is characterized in that the allyl group phosphonic acid ester comprise in Dimethyl ally phosphite, allyl group diethyl phosphonate, 2-propenyl diethyl phosphonate one or more mixture.
6. the special-purpose water reducer of gypsum according to claim 1, is characterized in that described initiator comprises one or more the mixture in hydrogen peroxide, ammonium persulphate, benzoyl peroxide.
7. the special-purpose water reducer of gypsum according to claim 1, is characterized in that described cationic monomer comprises one or more the mixture in cation acrylamide, acryloyl dimethylamine ethyl ester, diallyl dimethylamine.
8. the special-purpose water reducer of gypsum according to claim 1, is characterized in that described alkaline neutraliser comprises one or more the mixture in sodium hydroxide, potassium hydroxide, quadrol, trolamine.
9. the preparation method of the special-purpose water reducer of the described gypsum of claim 1, it is characterized in that take allyl ethers, vinylformic acid and allyl group phosphonic acid ester as monomer, and be aided with cationic monomer, alkaline neutraliser under the temperature condition of 30-50 ℃, and add initiator to carry out copolyreaction, make.
10. preparation method according to claim 9, the reaction times that it is characterized in that described copolyreaction is 4 hours.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104829161A (en) * | 2015-04-02 | 2015-08-12 | 安徽建筑大学 | Novel waterproof agent for building gypsum, and preparation method thereof |
| CN105152565A (en) * | 2015-08-12 | 2015-12-16 | 吉林众鑫化工集团有限公司 | Polyphosphonic acid type water reducing agents and synthesis method thereof |
| CN105731863A (en) * | 2014-12-09 | 2016-07-06 | 上海东大化学有限公司 | Viscosity-lowering type polycarboxylic acid water reducing agent and preparation and use methods therefor |
| CN107840927A (en) * | 2017-11-18 | 2018-03-27 | 苏州市兴邦化学建材有限公司 | A kind of gypsum based self-leveling mortar polycarboxylate water-reducer raw powder's production technology |
| CN111909324A (en) * | 2020-06-23 | 2020-11-10 | 山西佳维新材料股份有限公司 | Polycarboxylate superplasticizer and preparation method and application thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128495A (en) * | 2005-02-25 | 2008-02-20 | 建筑研究和科技有限公司 | Phosphorus-containing copolymers, method for the production thereof, and use thereof |
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2013
- 2013-07-19 CN CN201310306503.7A patent/CN103396032B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128495A (en) * | 2005-02-25 | 2008-02-20 | 建筑研究和科技有限公司 | Phosphorus-containing copolymers, method for the production thereof, and use thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105731863A (en) * | 2014-12-09 | 2016-07-06 | 上海东大化学有限公司 | Viscosity-lowering type polycarboxylic acid water reducing agent and preparation and use methods therefor |
| CN105731863B (en) * | 2014-12-09 | 2018-01-30 | 上海东大化学有限公司 | Glutinous type poly carboxylic acid series water reducer of one kind drop and preparation method thereof and application method |
| CN104829161A (en) * | 2015-04-02 | 2015-08-12 | 安徽建筑大学 | Novel waterproof agent for building gypsum, and preparation method thereof |
| CN105152565A (en) * | 2015-08-12 | 2015-12-16 | 吉林众鑫化工集团有限公司 | Polyphosphonic acid type water reducing agents and synthesis method thereof |
| CN105152565B (en) * | 2015-08-12 | 2017-05-10 | 吉林众鑫化工集团有限公司 | Polyphosphonic acid type water reducing agents and synthesis method thereof |
| CN107840927A (en) * | 2017-11-18 | 2018-03-27 | 苏州市兴邦化学建材有限公司 | A kind of gypsum based self-leveling mortar polycarboxylate water-reducer raw powder's production technology |
| CN111909324A (en) * | 2020-06-23 | 2020-11-10 | 山西佳维新材料股份有限公司 | Polycarboxylate superplasticizer and preparation method and application thereof |
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Effective date of registration: 20170406 Address after: 414009 Industrial Park, Yunxi District, Hunan, Yueyang Patentee after: Yueyang Oriental Yuhong Waterproof Technology Co., Ltd. Patentee after: Beijing Oriental Yuhong Waterproof Technology Co., Ltd. Address before: 101309 Shunyi District Shunping road section of Beijing City Area No. 2 Patentee before: Beijing Oriental Yuhong Waterproof Technology Co., Ltd. |
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