CN103396032B - Special water reducer of a kind of gypsum and preparation method thereof - Google Patents
Special water reducer of a kind of gypsum and preparation method thereof Download PDFInfo
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- CN103396032B CN103396032B CN201310306503.7A CN201310306503A CN103396032B CN 103396032 B CN103396032 B CN 103396032B CN 201310306503 A CN201310306503 A CN 201310306503A CN 103396032 B CN103396032 B CN 103396032B
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Abstract
The invention discloses the special water reducer of a kind of gypsum, with allyl ethers, vinylformic acid and allyl phosphonic acid ester for monomer, be aided with cationic monomer, alkaline neutraliser, add initiator and carry out copolyreaction and make.Gypsum of the present invention special water reducer water-reducing rate is high, and latent comparatively strong, gypsum adaptability is good, formaldehydeless pollution in production process, is adapted to especially in plaster of Paris and other plasterings.
Description
Technical field
The present invention relates to the special water reducer of a kind of gypsum, belong to chemical material field for building.
Background technology
Gypsum contains abundant non-ore resources and good process performance prosperity material as a kind of, and its processing is simple, energy consumption is lower, has the good characteristics such as quality is light, condensation is fast, radioactivity is supported, sound insulation, heat insulation, fire performance is good.
But the development of cement water reducing agent is obviously lagged behind for the research of the aspect of gypsum water reducer, 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 proper formulation 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 just there is the situation that poor fluidity and intensity are not up to standard in polycarboxylate water-reducer in application process.Traditional polycarboxylate water-reducer must in the face of gypsum is to a difficult problem for its influential effect.
For this problem, be generally by adopting polycarboxylic acids water reducing agent compositional to obtain performance preferably gypsum water reducer in the mode of retardant in current industry.This composite water-reducing agent dispersiveness is in earlier stage poor, and the sensitivity suitable to the volume of retardant.Patent CN1759928 and CN1786341 discloses the aid dispersion of a kind of dispersion agent for gypsum slurry.All adopt the compound containing the group such as carboxylic acid group, sulfonic acid and acid amides to carry out radical polymerization to form, but this technique needs dispersion agent and auxiliary dispersants with the use of, complex operation in application process.
Summary of the invention
For above-mentioned defect, the invention discloses the special water reducer of a kind of gypsum, there is higher dispersion and can 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 water reducer of a kind of gypsum, with allyl ethers, vinylformic acid and allyl phosphonic acid ester for monomer, is aided with cationic monomer, alkaline neutraliser, adds initiator and carries out copolyreaction and make.
Water reducer of the present invention, in preparation process, the consumption of water can adjust 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 and makes in water, the consumption of each composition, in mass, the amount ratio of each component is allyl ethers: vinylformic acid: water: allyl 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 isopentenol polyoxyethylene ether 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, allyl phosphonic acid ester comprise in Dimethyl ally phosphite, allyl phosphonic acid diethyl ester, 2-propenyl diethyl phosphonate one or more mixture, participate in reaction by introducing organic phosphoric acid molecule, molecular chain adds 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 induction 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 with traditional gypsum that compares, and there is certain latent constructability 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, by structure having carboxylic acid, phosphoric acid, hydroxyl, polyoxyethylene groups and amino group, is formed by the monomer polymerization of four kinds, has given full play to the synergy between each composition.
Accordingly, the invention discloses the preparation method of the special water reducer of described gypsum, with allyl ethers, vinylformic acid and allyl phosphonic acid ester for monomer, and be aided with cationic monomer, alkaline neutraliser under the temperature condition of 30-50 DEG C, add initiator and carry out copolyreaction, obtained.
Preferably, the reaction times of described copolyreaction is 4 hours, keeps good reaction yield.
Compared with prior art, water reducer of the present invention achieves following technical progress:
1. water-reducing rate is higher, under lower volume, have good dispersiveness to gypsum.
2. the gypsum slow setting time is longer, and application property is better, is conducive to the construction of gypsum and the shaping of plastering.
3. the adaptability of gypsum is better, all has good dispersive ability to the common gypsum of each department.
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 DEG C, through copolyreaction, obtain the transparent liquid of thick pale yellow after reaction in 4 hours, obtain the special water reducer of gypsum of solid content 40%.
Embodiment 2
By allyl polyether TPEG: vinylformic acid: water: allyl phosphonic acid diethyl ester: 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 DEG C, through copolyreaction, obtain the transparent liquid of thick pale yellow after reaction in 4 hours, obtain the special 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 DEG C, through copolyreaction, obtain the transparent liquid of thick pale yellow after reaction in 4 hours, obtain the special water reducer of gypsum of solid content 40%.
In order to evaluate the dispersing property of the special Water-reducing Admixtures To Cements of gypsum of the present invention, plaster of Paris degree of mobilization, standard consistency measure carries out with reference to GB9776-88 " plaster of Paris ".
Slump test is as follows: 125g water and quantitative water reducer are poured into stirrer for mixing even, add plaster of Paris 200g in 5s, and mix stirs 35s and obtains gypsum slurry.Then, in rapid injection ring mould cylinder, scrape off with scraper the slurry that overflows, rapid standing ring mould (desulfurated plaster contacts with water and starts to complete in 50s).Measure pulp flow degree.
Experimental result sees the following form shown in 1.
The dynamic degree experiment of plaster of Paris stream of slurry of the special 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 |
From above-mentioned, compared with polycarboxylate water-reducer, the special water reducer of gypsum of the present invention, improves the water-reducing rate of water reducer, and produces formaldehydeless pollution, belongs to environmentfriendly products.The special water reducer of the gypsum prepared by present method has excellent dispersing property and latent to gypsum, and better to the adaptability of gypsum than the common polycarboxylate water-reducer of commercially available PC.
Claims (6)
1. the special water reducer of gypsum, it is characterized in that with allyl ethers, vinylformic acid and allyl phosphonic acid ester for monomer, be aided with cationic monomer, alkaline neutraliser, add initiator to carry out copolyreaction and make, wherein, with molar ratio computing, the amount ratio of each component is allyl ethers: vinylformic acid: water: allyl 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); Wherein, described allyl ethers is allyl polyether; Described allyl phosphonic acid ester comprises one or more the mixture in Dimethyl ally phosphite, allyl phosphonic acid diethyl ester, 2-propenyl diethyl phosphonate; Described cationic monomer comprises one or more the mixture in cation acrylamide, acryloyl dimethylamine ethyl ester, diallyl dimethylamine.
2. the special water reducer of gypsum according to claim 1, is characterized in that its solid content is 40%.
3. the special 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.
4. the special 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.
5. the preparation method of the special water reducer of gypsum described in claim 1, it is characterized in that with allyl ethers, vinylformic acid and allyl phosphonic acid ester for monomer, and be aided with cationic monomer, alkaline neutraliser under the temperature condition of 30-50 DEG C, and add initiator and carry out copolyreaction, obtained.
6. preparation method according to claim 5, is characterized in that the reaction times of described copolyreaction is 4 hours.
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| 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 |
| CN104829161B (en) * | 2015-04-02 | 2016-09-28 | 安徽建筑大学 | A kind of plaster of Paris waterproofing agent and preparation 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 |
| CN107840927B (en) * | 2017-11-18 | 2020-10-16 | 苏州市兴邦化学建材有限公司 | Preparation method of polycarboxylate superplasticizer powder for gypsum-based self-leveling mortar |
| 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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| DE102005008671A1 (en) * | 2005-02-25 | 2006-08-31 | Construction Research & Technology Gmbh | New copolymer containing phosphor compounds, obtained by radical copolymerization of vinylpoly(alkyleneoxide) with ethylenic unsaturated monomer, useful as dispersing agent in solid dispersion |
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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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