CN115448631A - Amino acid gypsum retarder with strong alkali resistance - Google Patents
Amino acid gypsum retarder with strong alkali resistance Download PDFInfo
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- CN115448631A CN115448631A CN202211346304.4A CN202211346304A CN115448631A CN 115448631 A CN115448631 A CN 115448631A CN 202211346304 A CN202211346304 A CN 202211346304A CN 115448631 A CN115448631 A CN 115448631A
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- polyaspartate
- powder
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- amino acid
- gypsum
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
Abstract
The invention relates to an amino acid gypsum retarder with strong alkali resistance, belonging to the field of gypsum building materials, which 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 accelerant is polysuccinimide, and the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureidodisuccinate and trisodium methylglycine 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 use as a rich, ubiquitous mineral resource. It is commonly used for rendering gypsum, gypsum mortar, gypsum board, etc. Because the gypsum is extremely fast in hydration hardening and short in setting hardening time, the fluidity can be lost within a few minutes after the gypsum is stirred by adding water, the time required by forming and construction cannot be met, a gypsum retarder is required to be added in production and manufacturing, so that the gypsum slurry can keep plasticity for a long time, the sufficient production operation time is provided for gypsum products or gypsum slurry, and the construction performance of the gypsum is improved.
The retarder commonly used at present mainly comprises phosphate, organic acid and protein. Although the variety is various, 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 a gypsum hardened body, and the strength of gypsum is influenced. In contrast, protein retarders and polymeric amino acid retarders have ideal retarding effects and low strength loss rates, and are more promising retarders.
At present, due to the production process, some desulfurized gypsum contains calcium oxide, or in the reproduction process, alkaline substances such as calcium hydroxide and cement are often added into building gypsum in order to improve the application performance of the product, so that the existing desulfurized gypsum is mostly alkaline. The retarder on the market is mostly suitable for neutral environment, and the retarding effect is poor under alkaline condition. In order to ensure the stability of the application of the retarding property of the gypsum product, the development of an environment-friendly retarder suitable for alkaline environment is urgently 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: an 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 accelerant is polysuccinimide, and the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureidodisuccinate and trisodium methylglycine 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: uniformly mixing the aqueous solution of polyaspartic acid or polyaspartate with the aqueous solution of stabilizer in proportion, drying and crushing to obtain powder, and then mixing the powder with accelerator powder to obtain the gypsum retarder. Wherein the solid content of the stabilizer aqueous solution is 45 percent, and the solid content of the polyaspartic acid or polyaspartate aqueous solution is 40 percent.
The second method comprises the following steps: and mixing the polyaspartic acid or polyaspartate powder with stabilizer powder and accelerator powder to prepare the gypsum retarder. The particle size of the polyaspartic acid or polyaspartic acid salt powder is 100-150 meshes, the particle size of the stabilizer powder is 100-150 meshes, and the polyaspartic acid or polyaspartic acid salt powder and the stabilizer powder can be efficiently mixed by a vertical or horizontal mixer.
The beneficial effects of the invention are: the alkali-resistant amino acid gypsum retarder is prepared by compounding polyaspartic acid or polyaspartate, accelerating agent polysuccinimide and stabilizing agent, wherein the polyaspartate and the stabilizing agent in the components are mutually promoted, so that macromolecules are attached to the surface of a crystal, lattice distortion is caused to prevent the crystal from continuing to grow, calcium ions are complexed, the retarding effect is achieved, and the influence on the gypsum strength is small. The accelerating agent polysuccinimide can react with alkaline substances to continuously generate polymeric amino acid with a retarding effect, so that the retarder can completely adapt to an alkaline environment and has a positive correlation effect. The three components have synergistic effect, so that the problem of poor retarding effect of the amino acid gypsum retarder in the prior art in an alkaline environment is solved, and the unexpected effect that the retarding effect is not reduced and is not increased in the alkaline environment is obtained. After entering the environment, the amino acid gypsum retarder can be quickly decomposed and absorbed under the action of environmental microorganisms, is non-toxic and harmless to the environment, does not produce pollution, and is an environment-friendly gypsum retarder.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (based on solid content): 35 parts of calcium polyaspartate, 35 parts of polysuccinimide and 30 parts of calcium ureidodisuccinate.
Mixing the calcium polyaspartate aqueous solution and the ureidodisuccinate aqueous solution according to the mass ratio of 7.3:1, mixing uniformly at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to the proportion, and sieving by adopting a 150-mesh vibrating screen to remove the screen residue, wherein the sieved part is the retarder finished product.
Example 2
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (based on solid content): 40 parts of polyaspartic acid sodium, 30 parts of polysuccinimide and 30 parts of ureido disuccinate.
Mixing the aqueous solution of polyaspartic acid sodium and the aqueous solution of calcium ureidodisuccinate according to the mass ratio of 6.75:1, uniformly mixing at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to the proportion, and sieving by adopting a 150-mesh vibrating screen to remove the screen residue, wherein the sieved part is the retarder finished product.
Example 3
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (based on solid content): 50 parts of calcium polyaspartate, 25 parts of polysuccinimide and 25 parts of tetrasodium glutamate diacetate.
Mixing a polyaspartic acid calcium aqueous solution and a glutamic acid diacetic acid tetrasodium aqueous solution according to a mass ratio of 14.5:1, uniformly mixing at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to the proportion, and sieving by adopting a 150-mesh vibrating screen to remove the screen residue, wherein the sieved part is the retarder finished product.
Example 4
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (in terms of solid content): 30 parts of polyaspartic acid, 30 parts of polysuccinimide and 40 parts of ureido disodium disuccinate.
Mixing the aqueous solution of the calcium polyaspartate and the aqueous solution of the ureido disuccinic acid tetrasodium according to the mass ratio of 15.75:1, uniformly mixing at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to a proportion, and sieving by adopting a 150-mesh vibrating screen to remove the residue and obtain the retarder finished product at the part below the screen.
Example 5
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (in terms of solid content): 50 parts of calcium polyaspartate, 30 parts of polysuccinimide and 20 parts of trisodium methylglycinediacetate.
Mixing a calcium polyaspartate aqueous solution and a methylglycine diacetic acid trisodium aqueous solution according to a mass ratio of 15.75:1, mixing uniformly at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to the proportion, and sieving by adopting a 150-mesh vibrating screen to remove the screen residue, wherein the sieved part is the retarder finished product.
Example 6
The gypsum retarder formula of the embodiment comprises the following components in parts by weight (in terms of solid content): 45 parts of polyaspartic acid sodium, 30 parts of polysuccinimide and 25 parts of methylglycine diacetic acid trisodium.
Mixing a polyaspartic acid sodium aqueous solution and a methylglycine diacetic acid trisodium aqueous solution according to the mass ratio of 7.3:1, uniformly mixing at normal temperature, and then carrying out spray drying by using a spray drying tower to obtain powder. And mixing the powder and the polysuccinimide powder for 30 minutes by adopting a vertical high-efficiency mixer according to the proportion, and sieving by adopting a 150-mesh vibrating screen to remove the screen residue, wherein the sieved part is the retarder finished product.
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 by a 150-mesh vibrating sieve, and removing the residue.
Comparative example 2
The gypsum retarder formulation of this comparative example: 100% of sodium polyaspartate. Spray drying the aqueous solution of polyaspartic acid sodium to obtain powder, sieving with a 150-mesh vibrating sieve, and removing the residue.
Comparative example 3
The gypsum retarder formulation of this comparative example: 100% polysuccinimide. Spray drying the aqueous solution of polyaspartic acid sodium to obtain powder, sieving with a 150-mesh vibrating sieve, and removing the residue.
Comparative example 4
The gypsum retarder formulation of this comparative example: 100% calcium ureidodisuccinate.
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% trisodium methylglycinediacetic acid.
Comparative example 7
The gypsum retarder formulation and method of manufacture of this comparative example was substantially the same as example 1, except that calcium polyaspartate was not added.
Comparative example 8
The gypsum retarder formulation and method of manufacture of this comparative example is substantially the same as example 1, except that no polysuccinimide was added.
Comparative example 9
The gypsum retarder formulation and method of manufacture of this comparative example was substantially the same as example 1, except that calcium ureidodisuccinate was not added.
Comparative example 10
The gypsum retarder formulation and method of manufacture of this comparative example was substantially the same as example 6, except that no sodium polyaspartate was added.
Comparative example 11
The gypsum retarder formulation and method of manufacture of this comparative example was substantially the same as example 6, except that no polysuccinimide was added.
Comparative example 12
The gypsum retarder formulation of this comparative example is essentially the same as example 2, except that the sodium polyaspartate was replaced with potassium polyaspartate.
Comparative example 13
The gypsum retarder formulation of this comparative example: 50 parts of polyaspartic acid sodium, 40 parts of polysuccinimide and 10 parts of calcium ureidodisuccinate.
Comparative example 14
The gypsum retarder of the comparative example adopts retarder (protein) of certain brand sold in China, and the main component of the retarder is hydrolyzed protein.
The ingredients and contents of the examples and comparative examples are shown in Table 1.
TABLE 1 ingredient tables
The performance tests of the above examples and comparative examples were performed respectively, and the gypsum as the substrate was the same batch of desulfurized gypsum, one of which was gypsum without calcium hydroxide and the other of which was gypsum with calcium hydroxide added at about 1%, the pH was adjusted to 12 to 13, the setting time of the sample and the oven dry strength of the gypsum were measured respectively, the addition amount was 0.05% of the total weight of the gypsum, and the test results are shown in table 2.
TABLE 2 retarding effect of the retarders of the examples and comparative examples on desulfurized gypsum (0.05% gypsum retarder, except for the control group)
As can be seen from the data in Table 2, the gypsum retarder prepared by the invention, which comprises polyaspartic acid or polyaspartate, promoter polysuccinimide, stabilizer tetrasodium glutamate diacetate, ureido tetrasodium disuccinate and trisodium methylglycine diacetate, also keeps a good retarding effect under an alkaline condition; the comparative examples show that the gypsum retarder obtained by any one or two of the components is absent due to the synergistic effect of the three components, and the gypsum retarder shows a rule that the whole retarding effect is poor or the retarding effect is poor under alkaline conditions.
Finally, it should be noted that: 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 or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. The amino acid gypsum retarder with strong alkali resistance is characterized by comprising the following components in parts by weight: 60-80 parts of polyaspartic acid or polyaspartate, 20-30 parts of accelerator and 5-15 parts of stabilizer; the accelerant is polysuccinimide, and the stabilizer is one or a mixture of more of tetrasodium glutamate diacetate, tetrasodium ureidodisuccinate and trisodium methylglycine diacetate.
2. The strongly alkaline-resistant amino acid gypsum retarder of claim 1, wherein the polyaspartate is calcium polyaspartate or sodium polyaspartate.
3. The strongly alkaline-resistant amino acid gypsum retarder according to claim 1, characterized in that it is prepared by the following steps: uniformly mixing the aqueous solution of polyaspartic acid or polyaspartate with the aqueous solution of stabilizer in proportion, drying and crushing to obtain powder, and then mixing the powder with accelerator powder to obtain the gypsum retarder.
4. The alkali-resistant amino acid gypsum retarder of claim 3, wherein the aqueous stabilizer solution has a solid content of 45%.
5. The alkali-resistant strong amino acid gypsum retarder of claim 3, wherein the solid content of the aqueous solution of polyaspartic acid or polyaspartate is 40%.
6. The strongly alkaline-resistant amino acid gypsum retarder according to claim 1, characterized in that it is prepared by the following steps: and mixing the polyaspartic acid or polyaspartate powder with stabilizer powder and accelerator powder to prepare the gypsum retarder.
7. The strong alkali-resistant amino acid gypsum retarder of claim 6, wherein the particle size of the polyaspartic acid or polyaspartate powder is 100-150 meshes, and the particle size of the stabilizer powder is 100-150 meshes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211346304.4A CN115448631B (en) | 2022-10-31 | 2022-10-31 | Amino acid gypsum retarder with strong alkali resistance |
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| CN202211346304.4A 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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