CN115448631B - Amino acid gypsum retarder with strong alkali resistance - Google Patents
Amino acid gypsum retarder with strong alkali resistance Download PDFInfo
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- CN115448631B CN115448631B CN202211346304.4A CN202211346304A CN115448631B CN 115448631 B CN115448631 B CN 115448631B CN 202211346304 A CN202211346304 A CN 202211346304A CN 115448631 B CN115448631 B CN 115448631B
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- polyaspartate
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- powder
- amino acid
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 73
- 239000010440 gypsum Substances 0.000 title claims abstract description 73
- 150000001413 amino acids Chemical class 0.000 title claims abstract description 20
- 239000003513 alkali Substances 0.000 title claims abstract description 13
- 108010064470 polyaspartate Proteins 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000003381 stabilizer Substances 0.000 claims abstract description 17
- 229920000805 Polyaspartic acid Polymers 0.000 claims abstract description 14
- 229940061605 tetrasodium glutamate diacetate Drugs 0.000 claims abstract description 7
- UZVUJVFQFNHRSY-OUTKXMMCSA-J tetrasodium;(2s)-2-[bis(carboxylatomethyl)amino]pentanedioate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CC[C@@H](C([O-])=O)N(CC([O-])=O)CC([O-])=O UZVUJVFQFNHRSY-OUTKXMMCSA-J 0.000 claims abstract description 7
- GIYMJJRYEFFRKQ-UHFFFAOYSA-K [Na+].[Na+].[Na+].CNCC(=O)[O-].CNCC(=O)[O-].CNCC(=O)[O-] Chemical compound [Na+].[Na+].[Na+].CNCC(=O)[O-].CNCC(=O)[O-].CNCC(=O)[O-] GIYMJJRYEFFRKQ-UHFFFAOYSA-K 0.000 claims abstract description 6
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 23
- 239000007864 aqueous solution Substances 0.000 claims description 22
- 239000011575 calcium Substances 0.000 claims description 18
- 229910052791 calcium Inorganic materials 0.000 claims description 18
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical group [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 12
- 229920002197 Sodium polyaspartate Polymers 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 claims 1
- 230000000979 retarding effect Effects 0.000 abstract description 10
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 32
- 238000009472 formulation Methods 0.000 description 19
- 238000001694 spray drying Methods 0.000 description 15
- 238000007873 sieving Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 102000004169 proteins and genes Human genes 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 108010077895 Sarcosine Proteins 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- FSYKKLYZXJSNPZ-UHFFFAOYSA-N sarcosine Chemical compound C[NH2+]CC([O-])=O FSYKKLYZXJSNPZ-UHFFFAOYSA-N 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical group [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011426 gypsum mortar Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 235000018102 proteins Nutrition 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- -1 ureido tetrasodium disuccinate Chemical compound 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to an amino acid gypsum retarder with strong alkali resistance, which belongs to the field of gypsum building materials and is characterized by comprising the following components in parts by weight: 30-50 parts of polyaspartic acid or polyaspartate, 25-35 parts of accelerator and 20-40 parts of stabilizer; the accelerator is polysuccinimide, and the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureido disuccinate and trisodium methylglycinate diacetate; the invention solves the problem that the retarding effect of the amino acid gypsum retarder is reduced in an alkaline environment.
Description
Technical Field
The invention relates to the technical field of gypsum building materials, in particular to an amino acid gypsum retarder with strong alkali resistance.
Background
Gypsum has a long history of its use as a mineral resource that is abundant and widely available. Is commonly used for plastering gypsum, gypsum mortar, gypsum boards and the like. Because the gypsum is extremely fast in hydration and hardening, the setting and hardening time is short, the fluidity is lost within a few minutes after the water is added and the stirring, the time necessary for forming and construction cannot be met, and the gypsum retarder must be added in the production and manufacture process, so that the gypsum slurry can keep the plasticity for a long time, the sufficient production operation time is given to the gypsum product or the gypsum slurry, and the construction performance of the gypsum is improved.
The retarder commonly used at present mainly comprises phosphates, organic acids and proteins. Although the variety is wide, some retarders generate foaming phenomena such as phosphoric acid and citric acid when the mixing amount is too large, so that a plurality of pores appear in the gypsum hardened body to influence the strength of gypsum. In contrast, the retarder of protein and polymeric amino acids has ideal retarding effect and low strength loss rate, and is a more promising retarder.
At present, due to the production process, some desulfurized gypsum contains calcium oxide, or in the reproduction process, alkaline substances such as calcium hydroxide, cement and the like are often added into the building gypsum to improve the application performance of the product, so that the existing desulfurized gypsum is alkaline. The retarder in the prior market is mostly suitable for neutral environment, and the retarding effect can be poor under alkaline conditions. In order to ensure the stability of the application of the retarding property of gypsum products, development of a retarder suitable for gypsum in alkaline environment and environment protection is needed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the amino acid gypsum retarder with strong alkali resistance, and solves the problem that the retarding effect of the amino acid gypsum retarder is reduced in an alkaline environment.
The technical scheme for solving the technical problems is as follows: the amino acid gypsum retarder with strong alkali resistance is characterized by comprising the following components in parts by weight: 30-50 parts of polyaspartic acid or polyaspartate, 25-35 parts of accelerator and 20-40 parts of stabilizer; the accelerator is polysuccinimide, and the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureido disuccinate and trisodium methylglycinate diacetate.
Further, the polyaspartate is calcium polyaspartate or sodium polyaspartate.
Further, the gypsum retarder can be prepared by the following two preparation methods:
the method comprises the following steps: and uniformly mixing the polyaspartic acid or polyaspartate aqueous solution and the stabilizer aqueous solution in proportion, drying and crushing to obtain powder, and mixing the powder with the accelerator powder to obtain the gypsum retarder. Wherein the solid content of the aqueous solution of the stabilizer is 45%, and the solid content of the aqueous solution of polyaspartic acid or polyaspartate is 40%.
The second method is as follows: and mixing the polyaspartic acid or polyaspartate powder with stabilizer powder and accelerator powder to obtain the gypsum retarder. Wherein the grain diameter of the polyaspartic acid or polyaspartate powder is 100-150 meshes, the grain diameter of the stabilizer powder is 100-150 meshes, and the mixing can be performed by adopting a vertical or horizontal mixer for efficient mixing.
The beneficial effects of the invention are as follows: according to the alkali-resistant amino acid gypsum retarder, polyaspartic acid or polyaspartate is compounded with the accelerator polysuccinimide and the stabilizer, so that the polyaspartate and the stabilizer in the components are mutually promoted, macromolecules are attached to the surface of crystals, lattice distortion is caused to prevent the crystals from continuously growing, calcium ions are complexed, and the effect of retarding is achieved, and meanwhile, the influence on gypsum strength is small. The accelerator polysuccinimide can react with alkaline substances to continuously generate polymeric amino acid with a retarding effect, so that the retarder can completely adapt to alkaline environment and has positive correlation effect. The three components are synergistic, so that the problem of poor retarding effect of the amino acid gypsum retarder in the prior art under an alkaline environment is solved, and the unexpected effect that the retarding effect is not reduced and is reversely increased under the alkaline environment is obtained. After entering the environment, the amino acid gypsum retarder can be rapidly decomposed and absorbed under the action of environmental microorganisms, is nontoxic and harmless to the environment and does not produce pollution, so that the amino acid gypsum retarder is an environment-friendly gypsum retarder.
Detailed Description
The principles and features of the present invention are described below with examples provided for the purpose of illustration only and are not intended to limit the scope of the invention.
Example 1
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 35 parts of calcium polyaspartate, 35 parts of polysuccinimide and 30 parts of calcium ureido disuccinate.
The method comprises the steps of (1) mixing a calcium polyaspartate aqueous solution with an ureido disuccinate aqueous solution according to a mass ratio of 7.3:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Example 2
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 40 parts of sodium polyaspartate, 30 parts of polysuccinimide and 30 parts of calcium ureido disuccinate.
The sodium polyaspartate aqueous solution and the calcium ureido disuccinate aqueous solution are mixed according to the mass ratio of 6.75:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Example 3
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 50 parts of calcium polyaspartate, 25 parts of polysuccinimide and 25 parts of tetrasodium glutamate diacetate.
The method comprises the steps of (1) mixing a calcium polyaspartate aqueous solution with a tetrasodium glutamate diacetate aqueous solution according to a mass ratio of 14.5:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Example 4
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 30 parts of polyaspartic acid, 30 parts of polysuccinimide and 40 parts of tetra sodium ureido disuccinate.
The calcium polyaspartate aqueous solution and the tetra sodium ureido disuccinate aqueous solution are mixed according to the mass ratio of 15.75:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Example 5
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 50 parts of calcium polyaspartate, 30 parts of polysuccinimide and 20 parts of trisodium methylglycinate.
The calcium polyaspartate aqueous solution and the methyl glycine disodium acetate aqueous solution are mixed according to the mass ratio of 15.75:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Example 6
The gypsum retarder formulation of this example comprises the following components (by weight) in parts by weight: 45 parts of sodium polyaspartate, 30 parts of polysuccinimide and 25 parts of trisodium methylglycinate.
The sodium polyaspartate aqueous solution and the methyl glycine disodium acetate aqueous solution are mixed according to the mass ratio of 7.3:1, uniformly mixing at normal temperature, and then spray drying by a spray drying tower to obtain powder. Mixing the powder and polysuccinimide powder in a vertical efficient mixer for 30 min, sieving with a 150-mesh vibrating screen to remove screen residue, and obtaining the retarder product in the undersize part.
Comparative example 1
The gypsum retarder formulation of this comparative example: 100% of calcium polyaspartate. Spray drying the calcium polyaspartate aqueous solution to obtain powder, sieving with 150 mesh vibrating sieve, and removing the screen residue.
Comparative example 2
The gypsum retarder formulation of this comparative example: 100% of sodium polyaspartate. Spray drying the sodium polyaspartate aqueous solution to obtain powder, sieving with a 150-mesh vibrating screen, and removing the screen residue.
Comparative example 3
The gypsum retarder formulation of this comparative example: 100% polysuccinimide. Spray drying the sodium polyaspartate aqueous solution to obtain powder, sieving with a 150-mesh vibrating screen, and removing the screen residue.
Comparative example 4
The gypsum retarder formulation of this comparative example: 100% calcium ureido disuccinate.
Comparative example 5
The gypsum retarder formulation of this comparative example: 100% tetrasodium glutamate diacetate.
Comparative example 6
The gypsum retarder formulation of this comparative example: 100% of trisodium methylglycinate.
Comparative example 7
The formulation and preparation method of the gypsum retarder of this comparative example were basically the same as in example 1, except that no calcium polyaspartate was added.
Comparative example 8
The formulation and preparation method of the gypsum retarder of this comparative example were substantially the same as in example 1, except that polysuccinimide was not added thereto.
Comparative example 9
The formulation and preparation method of the gypsum retarder of this comparative example were substantially the same as in example 1, except that calcium ureido disuccinate was not added thereto.
Comparative example 10
The formulation and preparation method of the gypsum retarder of this comparative example were basically the same as in example 6, except that sodium polyaspartate was not added thereto.
Comparative example 11
The formulation and preparation method of the gypsum retarder of this comparative example were substantially the same as in example 6, except that polysuccinimide was not added thereto.
Comparative example 12
The gypsum retarder formulation of this comparative example was substantially the same as in example 2, except that sodium polyaspartate was replaced with potassium polyaspartate.
Comparative example 13
The gypsum retarder formulation of this comparative example: 50 parts of sodium polyaspartate, 40 parts of polysuccinimide and 10 parts of calcium ureido disuccinate.
Comparative example 14
The gypsum retarder of the comparative example adopts a brand retarder (proteins) sold in China and mainly comprises hydrolyzed protein.
The components and contents of each of the examples and comparative examples are shown in Table 1.
TABLE 1 Table of ingredients
The performance test was performed on the above examples and comparative examples, respectively, using the same batch of desulfurized gypsum as the substrate gypsum, and the first gypsum without calcium hydroxide and the second gypsum with about 1% calcium hydroxide were used, and the pH was adjusted to 12-13, and the setting time of the samples and the absolute dry strength of the gypsum were tested, respectively, with the addition amount of 0.05% of the total weight of the gypsum, and the test results are shown in Table 2.
Table 2 retarder effect of retarder on desulfurized gypsum (gypsum retarder addition 0.05% except for control group) for each example and comparative example
As can be seen from the data in Table 2, the gypsum retarder prepared by the invention comprises polyaspartic acid or polyaspartate, accelerator polysuccinimide, stabilizer tetrasodium glutamate diacetate, ureido tetrasodium disuccinate and methyl glycine trisodium diacetate, and has better retarding effect under alkaline condition; the above comparative examples can be seen to benefit from the synergy between the three, and the lack of gypsum retarder obtained from either or both components is indicative of either a poor overall retarder effect or a poor retarder effect under alkaline conditions.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (6)
1. The amino acid gypsum retarder with strong alkali resistance is characterized by comprising the following components in parts by weight: 30-50 parts of polyaspartic acid or polyaspartate, 25-35 parts of accelerator and 20-40 parts of stabilizer; the accelerator is polysuccinimide, the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureido disuccinate and trisodium methylglycinate diacetate, and the polyaspartate is calcium polyaspartate or sodium polyaspartate.
2. The alkali-resistant amino acid gypsum retarder according to claim 1, which is prepared by the following steps: and uniformly mixing the polyaspartic acid or polyaspartate aqueous solution and the stabilizer aqueous solution in proportion, drying and crushing to obtain powder, and mixing the powder with the accelerator powder to obtain the gypsum retarder.
3. The alkali-resistant amino acid gypsum retarder of claim 2, wherein the aqueous stabilizer solution has a solids content of 45%.
4. The alkali-resistant amino acid gypsum retarder according to claim 2, wherein the aqueous solution of polyaspartic acid or polyaspartate has a solids content of 40%.
5. The alkali-resistant amino acid gypsum retarder according to claim 1, which is prepared by the following steps: and mixing the polyaspartic acid or polyaspartate powder with stabilizer powder and accelerator powder to obtain the gypsum retarder.
6. The alkali-resistant amino acid gypsum retarder according to claim 5, wherein the polyaspartic acid or polyaspartate powder has a particle size of 100 to 150 mesh, and the stabilizer powder has a particle size of 100 to 150 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211346304.4A CN115448631B (en) | 2022-10-31 | 2022-10-31 | Amino acid gypsum retarder with strong alkali resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211346304.4A CN115448631B (en) | 2022-10-31 | 2022-10-31 | Amino acid gypsum retarder with strong alkali resistance |
Publications (2)
| Publication Number | Publication Date |
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| CN115448631A CN115448631A (en) | 2022-12-09 |
| CN115448631B true CN115448631B (en) | 2023-10-20 |
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| CN202211346304.4A Active CN115448631B (en) | 2022-10-31 | 2022-10-31 | Amino acid gypsum retarder with strong alkali resistance |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10017133A1 (en) * | 2000-04-06 | 2001-10-18 | Bk Giulini Chem Gmbh & Co Ohg | Use of polysuccinimide or polyaspartic acid polymers as set retardants for gypsum compositions |
| CN108033707A (en) * | 2017-12-29 | 2018-05-15 | 河北铁园科技发展有限公司 | Biodegradable wide temperate zone concrete retarder of a kind of environment-friendly type and its preparation method and application |
| CN112500018A (en) * | 2020-12-04 | 2021-03-16 | 河北协同环保科技股份有限公司 | Degradable efficient gypsum retarder and preparation method and application thereof |
| CN114751529A (en) * | 2022-01-13 | 2022-07-15 | 宜城成雄织造有限公司 | Environment-friendly phosphorus-free chelating agent and preparation method thereof |
-
2022
- 2022-10-31 CN CN202211346304.4A patent/CN115448631B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10017133A1 (en) * | 2000-04-06 | 2001-10-18 | Bk Giulini Chem Gmbh & Co Ohg | Use of polysuccinimide or polyaspartic acid polymers as set retardants for gypsum compositions |
| CN108033707A (en) * | 2017-12-29 | 2018-05-15 | 河北铁园科技发展有限公司 | Biodegradable wide temperate zone concrete retarder of a kind of environment-friendly type and its preparation method and application |
| CN112500018A (en) * | 2020-12-04 | 2021-03-16 | 河北协同环保科技股份有限公司 | Degradable efficient gypsum retarder and preparation method and application thereof |
| CN114751529A (en) * | 2022-01-13 | 2022-07-15 | 宜城成雄织造有限公司 | Environment-friendly phosphorus-free chelating agent and preparation method thereof |
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