CN115504702A - Organic acid-protein composite gypsum retarder and preparation method thereof - Google Patents
Organic acid-protein composite gypsum retarder and preparation method thereof Download PDFInfo
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- CN115504702A CN115504702A CN202211355668.9A CN202211355668A CN115504702A CN 115504702 A CN115504702 A CN 115504702A CN 202211355668 A CN202211355668 A CN 202211355668A CN 115504702 A CN115504702 A CN 115504702A
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- 239000010440 gypsum Substances 0.000 title claims abstract description 62
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 62
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 102000004169 proteins and genes Human genes 0.000 claims abstract description 55
- 108090000623 proteins and genes Proteins 0.000 claims abstract description 55
- 239000002699 waste material Substances 0.000 claims abstract description 28
- 150000007524 organic acids Chemical class 0.000 claims abstract description 20
- 239000010985 leather Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000001694 spray drying Methods 0.000 claims abstract description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 42
- 235000015165 citric acid Nutrition 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000007062 hydrolysis Effects 0.000 claims description 8
- 238000006460 hydrolysis reaction Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 4
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 claims description 4
- 239000000413 hydrolysate Substances 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- 230000003301 hydrolyzing effect Effects 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 235000011090 malic acid Nutrition 0.000 claims description 3
- 239000011259 mixed solution Substances 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 2
- 239000011022 opal Substances 0.000 claims description 2
- 230000000979 retarding effect Effects 0.000 abstract description 15
- 239000000843 powder Substances 0.000 abstract description 14
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract 1
- 235000018102 proteins Nutrition 0.000 description 45
- 239000000463 material Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000243 solution Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 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
- 230000001105 regulatory effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006911 enzymatic reaction Methods 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 235000004252 protein component Nutrition 0.000 description 2
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 229930182555 Penicillin Natural products 0.000 description 1
- JGSARLDLIJGVTE-MBNYWOFBSA-N Penicillin G Chemical compound N([C@H]1[C@H]2SC([C@@H](N2C1=O)C(O)=O)(C)C)C(=O)CC1=CC=CC=C1 JGSARLDLIJGVTE-MBNYWOFBSA-N 0.000 description 1
- 108091005804 Peptidases Proteins 0.000 description 1
- 239000004365 Protease Substances 0.000 description 1
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 description 1
- 244000269722 Thea sinensis Species 0.000 description 1
- 235000006468 Thea sinensis Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000020279 black tea Nutrition 0.000 description 1
- 230000006583 body weight regulation Effects 0.000 description 1
- 239000002639 bone cement Substances 0.000 description 1
- FNAQSUUGMSOBHW-UHFFFAOYSA-H calcium citrate Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O FNAQSUUGMSOBHW-UHFFFAOYSA-H 0.000 description 1
- 239000001354 calcium citrate Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000013355 food flavoring agent Nutrition 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 235000021190 leftovers Nutrition 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 229940049954 penicillin Drugs 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229920001184 polypeptide Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 102000004196 processed proteins & peptides Human genes 0.000 description 1
- 108090000765 processed proteins & peptides Proteins 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229960004889 salicylic acid Drugs 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- HELHAJAZNSDZJO-OLXYHTOASA-L sodium L-tartrate Chemical compound [Na+].[Na+].[O-]C(=O)[C@H](O)[C@@H](O)C([O-])=O HELHAJAZNSDZJO-OLXYHTOASA-L 0.000 description 1
- 239000001433 sodium tartrate Substances 0.000 description 1
- 229960002167 sodium tartrate Drugs 0.000 description 1
- 235000011004 sodium tartrates Nutrition 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 235000013337 tricalcium citrate Nutrition 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an organic acid-protein composite gypsum retarder and a preparation method thereof. The organic acid-protein composite gypsum retarder takes waste leather protein as a raw material, introduces organic acid, controls the molecular weight of the protein through water demodulation, and simultaneously takes the organic acid as an effective retarding component to form the organic acid-protein composite gypsum retarder. The organic acid solution and the waste leather protein powder are mixed according to a certain proportion, the protein is hydrolyzed to the molecular weight range with high retarding efficiency under the acidic condition, and then the water in the protein is removed by spray drying to prepare the organic acid-protein composite gypsum retarder. The gypsum composite retarder disclosed by the invention is simple in preparation process, low in energy consumption, low in cost and free of pollution, can fully play the synergistic effect of organic acid and protein, has the advantages of good solubility, high stability, no special smell, good retarding effect on gypsum, small strength loss and the like, and is suitable for industrial large-scale production.
Description
Technical Field
The invention discloses an organic acid-protein composite gypsum retarder and a preparation method thereof, and relates to the technical field of gypsum retarders.
Background
Gypsum, as an excellent cementitious material, is widely used in the construction industry and is one of three inorganic cementitious materials. Compared with other cementing materials, the gypsum has low production energy consumption, light weight, better heat preservation and insulation performance, strong machinability and plasticity, can be recycled, and belongs to a green cementing material. Through a certain production process, the gypsum can be processed into various types of gypsum variant materials with different properties. Such as building gypsum, can be used to produce plaster, ceiling, decorative acoustical panels and other decorative parts.
Because the early strength of the building gypsum material is developed quickly and the setting and hardening time is short, the building gypsum material loses fluidity within a few minutes and is difficult to meet the requirements of normal construction. In order to solve the problem, a retarder is usually added to adjust the setting time, so that the building gypsum slurry can keep plasticity for a long time, and the construction performance is improved. The commonly used building gypsum retarder mainly comprises organic acid and salts thereof, alkaline phosphate, protein retarder, composite retarder and the like. Previous researches show that organic acids such as citric acid, malic acid, succinic acid, adipic acid, tartaric acid, sodium tartrate, salicylic acid and the like, and alkaline phosphates such as sodium tripolyphosphate and the like have a certain retarding effect on gypsum, and have large loss on the strength of the gypsum. Among them, the organic acid citric acid has the strongest retarding effect on gypsum, and usually has obvious retarding effect when the mixing amount is small, but has larger strength loss on gypsum materials.
The protein retarder has the characteristics of good retarding effect and small strength loss on gypsum, and becomes a hotspot in the research field of gypsum retarders. Commonly used protein retarders include natural proteins and hydrolysis or decomposition products of proteins. Relevant researches show that natural proteins such as bone glue, black tea powder and the like can be used as a gypsum retarder to be added into a gypsum material, so that the setting time of the gypsum is prolonged, and the construction performance is improved. Many researches show that the protein retarder can be produced by processing waste proteins, so that the production cost is greatly reduced while the waste proteins are recycled. For example, the protein gypsum retarder can be prepared by processing wastes which mainly contain protein, such as wheat protein, penicillin hypha, leather leftovers, gelatin and the like. The molecular weight of the polypeptide in the protein retarder plays a leading role in the retarding effect of the retarder, and the protein waste is often required to be processed in the production process. Currently, protein waste is processed by hydrolysis and enzymatic methods. Wherein the hydrolysis method generally comprises hydrolyzing protein with inorganic acid such as hydrochloric acid or sulfuric acid, and strong base such as calcium hydroxide or sodium hydroxide, regulating its molecular weight to a suitable range, and removing acid, alkali or salt formed by neutralization to obtain protein retarder. The enzymatic method treats waste protein by specific protease to prepare the protein retarder, but is usually accompanied with higher production cost and harsh production environment.
In recent years, various composite gypsum-like retarders have been developed and used due to the needs of industrial production. Because the protein retarder has little influence on the strength of the gypsum, a certain amount of protein components are often added when the composite gypsum retarder is produced. If the composite gypsum-like retarder contains protein components, the molecular weight of the composite gypsum-like retarder is always considered to be important. Usually, molecular weight regulation of protein is used as a first step, a semi-finished product is obtained after impurity components are removed, and then the semi-finished product is synthesized with other substances or simply mixed according to a certain proportion to prepare the composite gypsum retarder by a two-step method. The process is complicated, the process is complex, the energy consumption is high, and the removal of salt or catalyst generated by regulating the molecular weight of protein is accompanied with higher production cost. Therefore, the development of a preparation method of the composite retarder with one step, low cost, simple process, good retarding effect and small strength loss is not easy.
Disclosure of Invention
The invention mainly solves the technical problem of overcoming the defects of the background technology and provides an organic acid-protein composite gypsum retarder prepared by one step and a preparation method thereof. The composite gypsum retarder is prepared by taking waste leather protein as a raw material, hydrolyzing the waste protein under an acidic condition by introducing organic acid to regulate the molecular weight of the protein, and taking the organic acid as an effective retarding component by one step. The organic acid and the protein in the composite retarder act synergistically, so that the retarder not only has a strong retarding effect, but also has small strength loss on gypsum materials; meanwhile, the one-step preparation has the advantages of simple process, low energy consumption and low production cost.
An organic acid-protein composite gypsum retarder and a preparation method thereof, wherein the composite gypsum retarder consists of organic acid and hydrolyzed waste protein thereof.
An organic acid-protein composite gypsum retarder and a preparation method thereof, wherein the organic acid-protein composite gypsum retarder is prepared by one-step hydrolysis, and comprises the following steps:
(1) According to the mass parts: fully mixing and dissolving 5-9 parts of waste leather protein, 1-5 parts of organic acid and 50-90 parts of water in a reaction kettle;
(2) Heating at 80-100 ℃ to hydrolyze the mixed solution for 12-24 h, and spray drying the hydrolysate after hydrolysis to obtain the organic acid-opal retarder powder.
Preferably, the organic acid includes one or two of citric acid, oxalic acid, succinic acid, malic acid, tartaric acid, and the like.
Preferably, the waste leather protein is chromium-removed protein, and the average molecular weight is 10 w-15 w Da.
Preferably, the atomization temperature of the hydrolysate spray drying is 150-200 DEG C
The positive beneficial effects of the invention
According to the invention, organic acid and waste leather protein are processed by a hydrothermal method, the molecular weight of the waste leather protein is regulated and controlled by using the organic acid, and meanwhile, the organic acid is also used as an effective retarding component to prepare the organic acid-protein composite gypsum retarder by one step. The organic acid and the protein play a synergistic retarding role, have certain antioxidant and bactericidal effects and can improve the stability of the composite retarder. The mixed solution after hydrolysis is spray-dried by a spray-drying method, so that the solubility of the retarder is improved. Citric acid is a flavoring agent, and other odor modifiers are not required in the process. Compared with the traditional two-step method for producing the composite gypsum retarder, the method has the advantages of simple process, low energy consumption, low cost and no pollution, and the produced composite gypsum retarder has the advantages of good solubility, high stability, no special smell, good retarding effect on gypsum, small strength loss and the like. Meanwhile, the invention also provides a feasible technical route for recycling the waste protein resources.
Detailed Description
The present invention is described in detail below with reference to examples, but the scope of the present invention is not limited thereto:
example one
One part of citric acid, ten parts of waste leather protein and one hundred parts of water are uniformly mixed and added into a reaction kettle, and the mixture reacts for 12 to 24 hours at the temperature of between 80 and 100 ℃. The solution is prepared into retarder powder through a spray dryer, and then the retarder powder is added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
Example two
Uniformly mixing one part of citric acid, four parts of waste leather protein and forty parts of water, adding the mixture into a reaction kettle, and reacting at the temperature of 80-100 ℃ for 12-24 hours. The solution is prepared into retarder powder through a spray dryer, and then the retarder powder is added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
EXAMPLE III
Uniformly mixing one part of citric acid, one part of waste leather protein and ten parts of water, adding the mixture into a reaction kettle, and reacting at the temperature of 80-100 ℃ for 12-24 hours. The solution is prepared into retarder powder through a spray dryer, and then the retarder powder is added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
Example four
Uniformly mixing one part of oxalic acid, four parts of waste leather protein and fifty parts of water, adding the mixture into a reaction kettle, and reacting for 12-24 hours at 80-100 ℃. The solution is prepared into retarder powder by a spray dryer, and then added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
EXAMPLE five
One part of succinic acid, five parts of waste leather protein and one hundred parts of water are uniformly mixed and added into a reaction kettle, and the mixture reacts for 12 to 24 hours at the temperature of between 80 and 100 ℃. The solution is prepared into retarder powder through a spray dryer, and then the retarder powder is added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
EXAMPLE six
One part of tartaric acid, ten parts of waste leather protein and forty parts of water are uniformly mixed and added into a reaction kettle, and the mixture reacts for 12 to 24 hours at a temperature of between 80 and 100 ℃. The solution is prepared into retarder powder by a spray dryer, and then added into the building gypsum to respectively measure the setting time and the mechanical property of the building gypsum according to GB/T17669.4-1999 and GB/T17669.3-1999.
Table 1 comparison of the setting time and strength (3 d wet strength) measurements of building plasters obtained by incorporating the composite retarder prepared in each example into building plasters (0.05% loading, blank: pure gypsum):
| initial setting time/min | Final setting time/min | Flexural strength/MPa | Compressive strength/MPa | |
| Blank space | 28 | 37 | 2.4 | 3.5 |
| Example one | 89 | 100 | 2.4 | 3.5 |
| Example two | 107 | 119 | 2.4 | 3.5 |
| EXAMPLE III | 154 | 166 | 1.7 | 2.5 |
| Example four | 95 | 103 | 2.1 | 3.0 |
| EXAMPLE five | 70 | 85 | 2.2 | 3.3 |
| EXAMPLE six | 78 | 90 | 2.3 | 3.2 |
Table 2 shows that citric acid, a compound retarder, and hydrolyzed waste protein (the preparation method and conditions are the same as those of the compound retarder, and citric acid is removed after hydrolysis) are respectively added into the building gypsum (the addition amount is 0.15%), and the setting time and the compression strength of the building gypsum are compared:
under the condition of the same mixing amount of the retarder, compared with citric acid and waste protein, the composite retarder has better retarding effect and small strength loss.
Determination of molecular weight
The retarder prepared in example two is dissolved in water, and then a certain amount of calcium hydroxide is added to react citric acid with the calcium hydroxide to generate calcium citrate precipitate, so that the citric acid is removed. After filtration, the remaining solution was spray dried to obtain a protein powder of appropriate molecular weight. The average molecular weights of the waste leather protein and the hydrolyzed protein obtained by separating citric acid in the example were measured by Gel Permeation Chromatography (GPC) and were 10-15 w Da and 8w Da, respectively
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (5)
1. An organic acid-protein composite gypsum retarder and a preparation method thereof are characterized in that the composite gypsum retarder consists of organic acid and hydrolyzed waste protein thereof.
2. An organic acid-protein composite gypsum retarder and a preparation method thereof are characterized in that the organic acid-protein composite gypsum retarder is prepared by one-step hydrolysis and comprises the following steps:
(1) Fully mixing and dissolving 5-9 parts by mass of waste leather protein, 1-5 parts by mass of organic acid and 50-90 parts by mass of water in a reaction kettle;
(2) Hydrolyzing the mixed solution for 12-24 h at 80-100 ℃, and then spray drying the hydrolysate to prepare the powdery organic acid-opal retarder.
3. The method according to claim 2, wherein the organic acid in step (1) comprises one or two of citric acid, oxalic acid, succinic acid, malic acid, tartaric acid, and the like.
4. The method as claimed in claim 2, wherein the waste leather protein of step (1) is dechromized protein and has an average molecular weight of 10 w-15 w Da.
5. The method according to claim 2, wherein the atomization temperature of the spray drying of the hydrolysate in the step (2) is 150-200 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355668.9A CN115504702B (en) | 2022-11-01 | 2022-11-01 | Organic acid-protein composite gypsum retarder and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211355668.9A CN115504702B (en) | 2022-11-01 | 2022-11-01 | Organic acid-protein composite gypsum retarder and preparation method thereof |
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| CN115504702A true CN115504702A (en) | 2022-12-23 |
| CN115504702B CN115504702B (en) | 2023-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115947559A (en) * | 2023-03-03 | 2023-04-11 | 浙江科技学院 | Preparation method of keratin polypeptide-based gypsum retarder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115947559A (en) * | 2023-03-03 | 2023-04-11 | 浙江科技学院 | Preparation method of keratin polypeptide-based gypsum retarder |
| CN115947559B (en) * | 2023-03-03 | 2024-04-09 | 浙江科技学院 | Preparation method of keratin polypeptide-based gypsum retarder |
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|---|---|
| CN115504702B (en) | 2023-07-28 |
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