CN119219989A - A method for preparing a high-performance hydroxypropyl starch ether and polymer material composite product - Google Patents
A method for preparing a high-performance hydroxypropyl starch ether and polymer material composite product Download PDFInfo
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 239000002861 polymer material Substances 0.000 title claims abstract description 48
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 239000001341 hydroxy propyl starch Substances 0.000 title claims abstract description 37
- 235000013828 hydroxypropyl starch Nutrition 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229920002472 Starch Polymers 0.000 claims abstract description 41
- 235000019698 starch Nutrition 0.000 claims abstract description 41
- 239000008107 starch Substances 0.000 claims abstract description 41
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000002360 preparation method Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 21
- 239000002904 solvent Substances 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000003112 inhibitor Substances 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 239000000047 product Substances 0.000 claims description 46
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000006266 etherification reaction Methods 0.000 claims description 12
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 12
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 12
- -1 alkali metal salt Chemical class 0.000 claims description 10
- 239000012043 crude product Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 4
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 4
- 150000008044 alkali metal hydroxides Chemical group 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 3
- JDSQBDGCMUXRBM-UHFFFAOYSA-N 2-[2-(2-butoxypropoxy)propoxy]propan-1-ol Chemical compound CCCCOC(C)COC(C)COC(C)CO JDSQBDGCMUXRBM-UHFFFAOYSA-N 0.000 claims description 2
- 229920002261 Corn starch Polymers 0.000 claims description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 claims description 2
- 229940106681 chloroacetic acid Drugs 0.000 claims description 2
- HRYZWHHZPQKTII-UHFFFAOYSA-N chloroethane Chemical compound CCCl HRYZWHHZPQKTII-UHFFFAOYSA-N 0.000 claims description 2
- 239000008120 corn starch Substances 0.000 claims description 2
- 229960003750 ethyl chloride Drugs 0.000 claims description 2
- 229920002401 polyacrylamide Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 229920001592 potato starch Polymers 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- NEHMKBQYUWJMIP-NJFSPNSNSA-N chloro(114C)methane Chemical compound [14CH3]Cl NEHMKBQYUWJMIP-NJFSPNSNSA-N 0.000 claims 1
- 230000003113 alkalizing effect Effects 0.000 abstract description 15
- 230000008719 thickening Effects 0.000 abstract description 4
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000000314 lubricant Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000004806 packaging method and process Methods 0.000 description 8
- 238000007873 sieving Methods 0.000 description 8
- 206010016807 Fluid retention Diseases 0.000 description 6
- 239000004368 Modified starch Substances 0.000 description 6
- 229920000881 Modified starch Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 235000019426 modified starch Nutrition 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000007385 chemical modification Methods 0.000 description 2
- NEHMKBQYUWJMIP-UHFFFAOYSA-N chloromethane Chemical compound ClC NEHMKBQYUWJMIP-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009974 thixotropic effect Effects 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013270 controlled release Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000001254 oxidized starch Substances 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- FDRCDNZGSXJAFP-UHFFFAOYSA-M sodium chloroacetate Chemical compound [Na+].[O-]C(=O)CCl FDRCDNZGSXJAFP-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
- C08L3/04—Starch derivatives, e.g. crosslinked derivatives
- C08L3/08—Ethers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
- C08B31/08—Ethers
- C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/34—Filling pastes
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Wood Science & Technology (AREA)
- Biochemistry (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention belongs to the technical field of starch ether composite materials, and relates to a preparation method of a high-performance hydroxypropyl starch ether and high-polymer material composite product, which comprises the steps of dissolving a high-polymer material in ethanol, adding an etherifying agent as a reaction dispersing agent, sequentially adding starch, an alkalizing agent and an inhibitor, mixing, alkalizing for a certain time, and then heating for modification to obtain the high-performance hydroxypropyl starch ether and high-polymer material composite product; the invention mixes the polymer material with alcohol as the reaction dispersing agent, improves the reaction efficiency of the etherifying agent by changing the preparation solvent of the starch ether on the basis of keeping the performance of the existing product, has excellent lubricant, plasticity and thickening property, can be used for preparing putty powder or mortar, obviously improves the viscosity, the consistency and the water retention rate, completely fuses the advantages of the hydroxypropyl starch ether and the polymer material, and provides better choice for terminal customers. The preparation method has simple process and easy operation, is suitable for large-scale popularization and application, and has wide market prospect.
Description
Technical Field
The invention belongs to the technical field of starch ether composite materials, and relates to a preparation method of a high-performance hydroxypropyl starch ether and high-polymer material composite product.
Background
The chemical modification of starch refers to the modification of raw starch by chemical reagent treatment, which changes its properties by structural change, so as to meet the application requirements, and generally the chemically modified starch can be divided into two main categories, one category is the reduction of the molecular weight of modified starch, such as acidolyzed starch, oxidized starch, etc., and the other category is the increase of the molecular weight of modified starch, such as crosslinked starch, esterified starch, carboxymethyl starch and hydroxypropyl starch.
The most widely used chemical modification in the market at present mainly comprises two types, namely, hydroxypropyl (carboxymethyl) starch is an ether compound generated by substitution reaction of propylene oxide (sodium chloroacetate) with hydroxyl groups in the starch under alkaline conditions and introduction of hydroxypropyl (carboxymethyl) groups into the starch. A multi-group cross-linked modified starch ether is prepared by modifying hydroxypropyl starch as base and adding cross-linking agent. Preparation of a crosslinked carboxymethyl hydroxypropylated composite modified starch as described in patent number 202110461697.2. The crosslinked carboxymethyl hydroxypropyl composite modified starch ether retains the hydrophilic characteristic brought by hydroxypropylation, improves the workability and the water retention, and simultaneously greatly increases the consistency and substantially improves the sagging resistance due to the introduction of carboxymethyl.
Sodium polyacrylate is a high molecular compound, is commonly used for manufacturing various aqueous adhesives, controlled release agents, polymer dispersants and the like, and is widely applied to various fields of construction, chemical industry, plastics, medicines, textiles and the like. The effect of the sodium polyacrylate mortar is mainly shown in the following aspects of 1. The toughness and the adhesive force of the mortar are improved, and compared with the traditional mortar, the sodium polyacrylate mortar has higher strength, stronger hardness and better toughness. Meanwhile, the adhesive force of the mortar can be increased, so that the mortar and the building material are adhered more tightly, and the overall stability of the building is improved. 2. The water resistance and durability of the mortar are improved, and the sodium polyacrylate mortar has the advantages of moisture resistance, good water resistance, certain flexibility and difficult cracking. Therefore, it not only can maintain better performance in a wet environment, and the performance of the material can be well maintained under complex conditions such as climate change, temperature change and the like.
However, with the continuous development of market, the hydroxypropyl starch ether and the composite starch ether products cannot meet the use requirements of the terminal market, and the cement-based products and the gypsum-based products have risks of strength loss while pursuing the lubricity and thickening property brought by thixotropic properties of the starch ether, so that many enterprises choose to add high polymer materials to endow the system with lubricity, but lack the thixotropic properties of the starch ether. It is necessary to develop a method for combining a polymer material and starch ether, solving the disadvantages of the existing single component and playing the complementary advantages of the polymer material and the starch ether.
Disclosure of Invention
The invention aims to solve the defects existing in the prior art, provides a preparation method of a high-performance hydroxypropyl starch ether and polymer material composite product, and on the basis of keeping the performance of the existing product, the reaction efficiency of the etherifying agent is improved by changing the preparation solvent of the starch ether, so that the starch ether particles are attached to the periphery of the polymer crystal, and a novel composite material is obtained.
In order to achieve the above purpose, the invention provides a preparation method of a high-performance hydroxypropyl starch ether and polymer material composite product, which comprises the following steps:
(1) Mixing a high polymer material, an etherifying agent and alcohol to prepare a dispersible solution serving as a reaction dispersing agent;
(2) Alkalizing, namely adding starch, an alkalizing agent and an inhibitor into a reaction dispersing agent, and alkalizing for a certain time to obtain an alkalized substance;
(3) Preparing a crude product, namely heating the alkalized material to carry out etherification reaction, and after the reaction is finished, placing the solvent in a reaction system into a condenser to carry out condensation recovery through heating, wherein the material recovered through the solvent is the crude product;
(4) The preparation of the novel composite product comprises the steps of crushing the crude product to obtain the high-performance hydroxypropyl starch ether and high polymer material composite product.
The high polymer material is one or more of polyvinyl alcohol, polyethylene oxide, polyacrylamide and sodium polyacrylate, starch is one or more of potato starch, tapioca starch and corn starch, the alkalizing agent is alkali metal hydroxide, the alcohol is one or more of methanol, ethanol, isopropanol, n-butanol, tert-butanol, acetone and diethylene glycol, the inhibitor is alkali metal salt, and the etherifying agent is one or more of chloroacetic acid, chloromethane, chloroethane, propylene glycol ether, propylene oxide and ethylene oxide.
The high polymer material is sodium polyacrylate, the alkali metal hydroxide is sodium hydroxide, the alcohol is ethanol, the inhibitor is one or two of sodium sulfate and sodium chloride, and the etherifying agent is propylene oxide.
The alkalization reaction time is 30-50min, the alkalization temperature is 20-30 ℃, the etherification reaction is that the temperature is raised to 50-60 ℃ and kept for 1.5-2 hours, then the temperature is raised to 70-50 ℃ and kept for 1-1.5 hours.
The mass ratio of the starch, the polymer material, the alkalizing agent, the inhibitor and the alcohol to the etherifying agent is 1 (0.01-0.1), 0.05-0.2, 0.05-0.1, 0.1-1 and 0.1-1.
The invention also provides application of the high-performance hydroxypropyl starch ether and high polymer material composite product prepared by the preparation method in preparing putty powder or mortar.
Compared with the prior art, the invention has the advantages that the high polymer material is mixed with alcohol to be used as a reaction dispersing agent, the reaction efficiency of the etherifying agent is improved on the basis of keeping the performance of the existing product by changing the preparation solvent of the starch ether, starch ether particles are attached to the periphery of high polymer crystals to obtain a novel composite material, after desolventizing, the reaction product can be directly crushed without drying, the product has excellent lubricity, plasticity and thickening property, can be used for preparing putty powder or mortar, and obviously improves the viscosity, consistency and water retention rate of the putty powder or mortar, and under the condition of ensuring that the use cost is not overlapped, the product completely fuses the advantages of hydroxypropyl starch ether and the high polymer material, thereby providing better choice for terminal customers. The preparation method has simple process and easy operation, is suitable for large-scale popularization and application, and has wide market prospect.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to specific embodiments.
Example 1:
The embodiment relates to a preparation method of a high-performance hydroxypropyl starch ether and high polymer material composite product, which comprises the following specific steps:
(1) The preparation of the solution comprises the steps of adding 50 parts of ethanol, 20 parts of etherifying agent propylene oxide and 2 parts of sodium polyacrylate into a reaction kettle according to parts by weight, stirring and dispersing for 0.5h, and taking the mixture as a reaction dispersing agent;
(2) Alkalizing, namely adding 100 parts of starch, 10 parts of sodium hydroxide and 10 parts of inhibitor sodium sulfate into a reaction kettle according to parts by weight, and alkalizing for 40 minutes at 25 ℃;
(3) The preparation of crude products comprises the steps of etherification reaction, solvent recovery, and the specific steps are as follows:
Etherification, namely heating to 50 ℃ for 1.5 hours, then heating to 70 ℃ and keeping for 1.5 hours;
recovering, namely starting a hot water pump, slowly heating the temperature from 70 ℃ to 110 ℃, and recovering the solvent through a condenser when the pressure in the kettle is reduced to 0.2 mpa;
(4) Crushing and packaging, namely conveying the dried material to a micronizer, crushing to a sieving rate of more than 99% by 80 meshes, packaging and warehousing after the sieving rate is checked to be qualified, and obtaining a starch ether-based polymer material composite product, namely a high-performance hydroxypropyl starch ether and polymer material composite product.
Example 2:
The embodiment relates to a preparation method of a high-performance hydroxypropyl starch ether and high polymer material composite product, which comprises the following specific steps:
(1) Adding 40 parts of ethanol, 30 parts of etherifying agent propylene oxide and 6 parts of sodium polyacrylate into a reaction kettle according to parts by weight, stirring and dispersing for 0.6h, and taking the mixture as a reaction dispersing agent;
(2) Alkalizing, namely adding 100 parts of starch, 8 parts of sodium hydroxide and 10 parts of inhibitor sodium chloride into a reaction kettle according to parts by weight, and alkalizing for 30 minutes at 25 ℃;
(3) The preparation of crude products comprises the steps of etherification reaction, solvent recovery, and the specific steps are as follows:
Etherification, namely raising the temperature to 55 ℃ for 1.5 hours, raising the temperature to 75 ℃ and keeping the temperature for 1.5 hours;
Recovering, namely starting a hot water pump, slowly heating from 75 ℃ to 120 ℃, and recovering the solvent through a condenser when the pressure in the kettle is reduced to 0.2 mpa;
(4) Crushing and packaging, namely conveying the dried material to a micronizer, crushing to a sieving rate of more than 99% by 80 meshes, packaging and warehousing after the sieving rate is checked to be qualified, and obtaining a starch ether-based polymer material composite product, namely a high-performance hydroxypropyl starch ether and polymer material composite product.
Example 3:
The embodiment relates to a preparation method of a high-performance hydroxypropyl starch ether and high polymer material composite product, which comprises the following specific steps:
(1) Adding 30 parts of ethanol, 30 parts of etherifying agent propylene oxide and 4 parts of sodium polyacrylate into a reaction kettle according to parts by weight, stirring and dispersing for 0.5h, and taking the mixture as a reaction dispersing agent;
(2) Alkalizing, namely adding 100 parts of starch, 12 parts of sodium hydroxide and 10 parts of inhibitor sodium sulfate into a reaction kettle according to parts by weight, and alkalizing for 50 minutes at 25 ℃;
(3) The preparation of crude products comprises the steps of etherification reaction, solvent recovery, and the specific steps are as follows:
Etherification, namely heating to 60 ℃ for 2 hours, heating to 80 ℃ and keeping for 1 hour;
Recovering, namely starting a hot water pump, slowly heating the temperature to 120 ℃ from 80 ℃, starting a vacuum pump when the pressure in the kettle is reduced to 0.2mpa, and recovering the solvent through a condenser;
(4) Crushing and packaging, namely conveying the dried material to a micronizer, crushing to a sieving rate of more than 99% by 80 meshes, packaging and warehousing after the sieving rate is checked to be qualified, and obtaining a starch ether-based polymer material composite product, namely a high-performance hydroxypropyl starch ether and polymer material composite product.
Example 4:
The embodiment relates to a preparation method of a high-performance hydroxypropyl starch ether and high polymer material composite product, which comprises the following specific steps:
(1) The preparation of the solution comprises the steps of adding 20 parts of ethanol, 30 parts of etherifying agent propylene oxide and 5 parts of sodium polyacrylate into a reaction kettle according to parts by weight, stirring and dispersing to obtain a reaction dispersing agent;
(2) Alkalizing, namely adding 100 parts of starch, 10 parts of sodium hydroxide and 10 parts of inhibitor sodium sulfate into a reaction kettle according to parts by weight, and alkalizing for 40 minutes at 25 ℃;
(3) The preparation of crude products comprises the steps of etherification reaction, solvent recovery, and the specific steps are as follows:
Etherification, namely raising the temperature to 55 ℃ for 1.5 hours, raising the temperature to 75 ℃ and keeping the temperature for 1.5 hours;
Recovering, namely starting a hot water pump, slowly heating from 75 ℃ to 120 ℃, and recovering the solvent through a condenser when the pressure in the kettle is reduced to 0.2 mpa;
(4) Crushing and packaging, namely conveying the dried material to a micronizer, crushing to a sieving rate of more than 99% by 80 meshes, packaging and warehousing after the sieving rate is checked to be qualified, and obtaining a starch ether-based polymer material composite product, namely a high-performance hydroxypropyl starch ether and polymer material composite product.
Example 5:
This example relates to the effect of using the starch ether based polymer composite products prepared in examples 1-5, and the water content, viscosity and hydroxypropyl content of the products prepared in example 3 and comparative example were measured according to a test method commonly used in the art using commercially available hydroxypropyl starch ether as a comparative example, and the results are shown in table 1.
TABLE 1 physicochemical index
From comparison of physical and chemical indexes in table 1, the hydroxypropyl content and the moisture content of example 3 are not greatly changed, but the viscosity is significantly improved as compared with the comparative example. The polymer material dispersed by ethanol is used as solvent medium, and hydroxypropyl starch ether particles are adhered to polymer material crystals after heating and drying, so that the viscosity is greatly improved, and the hydroxypropyl content in the starch ether is not affected.
The influence of the product prepared in example 3 on the mortar performance is detected by taking 0.3 part of the product prepared in example 3, 300 parts of ordinary Portland cement, 700 parts of standard sand, 2 parts of HPMC (hydroxypropyl methylcellulose) and a proper amount of water as raw materials in parts by weight, preparing the mortar according to the existing mortar preparation method, detecting the consistency of the mortar according to the JGJ_T70-09 building mortar basic performance test method standard, replacing the product prepared in example 3 with commercially available hydroxypropyl starch ether, preparing the mortar according to the method, and taking the consistency detection result as a comparison example as shown in Table 2.
TABLE 2 consistency test results
The water retention of the mortars prepared in examples 1 to 4 was measured according to JGJ_T70-09 building mortar basic property test method standard, and the mortars prepared with commercially available hydroxypropyl starch ether were used as comparative examples, and the results are shown in Table 3.
Table 3 results of the mortar water retention test
As can be seen from Table 3, the water retention of the mortar prepared with the product of example 3 is the highest.
The data show that the starch ether-based polymer material composite product prepared by the preparation method of the high-performance hydroxypropyl starch ether and polymer material composite product can be used for preparing mortar, and is obviously superior to single hydroxypropyl starch ether in viscosity, water retention and thickening property.
According to JC/T298-2010 'putty powder for building indoor' standard, asbestos-free fiber cement plate is selected, water is added by 40% in combination with the method B in GB/T1728-1979, the mixture is uniformly stirred, smoothness and wettability are judged according to the surface drying and construction requirements, and the compositions of comparative putty powder and putty powder prepared by using the products of examples 1-4 are shown in Table 4.
Table 4 putty powder Components
Putty powder coating operations were performed using the putty powders prepared from the products of comparative examples and examples 1-4, with the effects shown in Table 5.
TABLE 5 putty powder coating effect
As is clear from Table 5, the putty powder of Experimental example 3 prepared from the composite product of hydroxypropyl starch ether and polymer material prepared in example 3 has improved workability and wettability compared with the commercially available hydroxypropyl starch ether.
Claims (6)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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