CN107903410B - Isobutene-maleic anhydride alternating copolymer/sodium alginate hydrogel and preparation method thereof - Google Patents
Isobutene-maleic anhydride alternating copolymer/sodium alginate hydrogel and preparation method thereof Download PDFInfo
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 235000010413 sodium alginate Nutrition 0.000 title claims abstract description 36
- 239000000661 sodium alginate Substances 0.000 title claims abstract description 36
- 229940005550 sodium alginate Drugs 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000000017 hydrogel Substances 0.000 title claims abstract description 24
- 229920005603 alternating copolymer Polymers 0.000 title claims abstract description 23
- RPOCFUQMSVZQLH-UHFFFAOYSA-N furan-2,5-dione;2-methylprop-1-ene Chemical compound CC(C)=C.O=C1OC(=O)C=C1 RPOCFUQMSVZQLH-UHFFFAOYSA-N 0.000 title claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000003755 preservative agent Substances 0.000 claims abstract description 14
- 230000002335 preservative effect Effects 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 abstract description 11
- 239000003431 cross linking reagent Substances 0.000 abstract description 9
- 238000001556 precipitation Methods 0.000 abstract description 5
- 239000000084 colloidal system Substances 0.000 abstract description 4
- 239000002386 air freshener Substances 0.000 abstract description 3
- 230000001815 facial effect Effects 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 abstract 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 30
- 239000000499 gel Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 150000001768 cations Chemical class 0.000 description 6
- 159000000007 calcium salts Chemical group 0.000 description 5
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 5
- 159000000003 magnesium salts Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 4
- 150000003751 zinc Chemical class 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- -1 polysaccharide carbohydrate Chemical class 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- AEMOLEFTQBMNLQ-AZLKCVHYSA-N (2r,3s,4s,5s,6r)-3,4,5,6-tetrahydroxyoxane-2-carboxylic acid Chemical compound O[C@@H]1O[C@@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H]1O AEMOLEFTQBMNLQ-AZLKCVHYSA-N 0.000 description 1
- AEMOLEFTQBMNLQ-SYJWYVCOSA-N (2s,3s,4s,5s,6r)-3,4,5,6-tetrahydroxyoxane-2-carboxylic acid Chemical compound O[C@@H]1O[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@@H]1O AEMOLEFTQBMNLQ-SYJWYVCOSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004971 Cross linker Substances 0.000 description 1
- 241000199919 Phaeophyceae Species 0.000 description 1
- 241000195474 Sargassum Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000008272 agar Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000019700 dicalcium phosphate Nutrition 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
- A61K8/733—Alginic acid; Salts thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8141—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/01—Deodorant compositions
- A61L9/012—Deodorant compositions characterised by being in a special form, e.g. gels, emulsions
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/01—Deodorant compositions
- A61L9/013—Deodorant compositions containing animal or plant extracts, or vegetable material
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q19/00—Preparations for care of the skin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/10—General cosmetic use
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
- A61L2209/20—Method-related aspects
- A61L2209/21—Use of chemical compounds for treating air or the like
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- C08J2305/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2301/00 or C08J2303/00
- C08J2305/04—Alginic acid; Derivatives thereof
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08J2423/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08J2423/22—Copolymers of isobutene; butyl rubber
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Abstract
The invention relates to an isobutene/maleic anhydride alternating copolymer/sodium alginate hydrogel and a preparation method thereof. The hydrogel consists of sodium alginate, a curing agent, a retarder, a cross-linking agent, a preservative and the balance of water. The hydrogel obtained by the invention has stable colloid performance, good temperature resistance, good stability at high temperature of 60 ℃, no water precipitation at low temperature of-20 ℃, simple preparation process and mild conditions, is a carrier with excellent performance, and can be used in the daily chemical fields of air fresheners, facial masks and the like.
Description
Technical Field
The product relates to the field of daily chemical products, in particular to an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel and a preparation method thereof.
Background
Sodium Alginate (AGS) is a polysaccharide carbohydrate extracted from brown algae such as herba Zosterae Marinae or Sargassum, and its molecule is formed by connecting β -D-mannuronic acid (β -D-mannuronic, M) and α -L-guluronic acid (α -L-guluronic, G) via (1 → 4) bond, and Sodium Alginate contains-COO－Group, Na in G unit when divalent cation is added to aqueous solution of sodium alginate+Exchange with these divalent cations and convert the sodium alginate solution to gel. However, the pure sodium alginate gel has a single crosslinking mode and is seriously separated from water under the low-temperature condition, so that the use of the sodium alginate gel under the low-temperature condition is greatly limited. The prior patent technology CN105601950A discloses a preparation method of a sodium alginate agar double-network high-strength natural hydrogel material, the process of the method is complex, the obtained gel strength is high, but the problems of high-temperature stability and serious water precipitation under low-temperature conditions can not be solved.
In view of the defects that the existing sodium alginate gel has obvious water evolution phenomenon when used at low temperature and is unstable at high temperature, the invention aims to provide the sodium alginate hydrogel which has simple preparation process, mild condition, high gel strength and good temperature resistance.
Disclosure of Invention
In one embodiment, the present invention provides an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel, wherein the hydrogel comprises:
a) sodium alginate; b) a crosslinking agent; c) a curing agent; d) a retarder; e) a preservative; f) water;
wherein the cross-linking agent is an amide-ammonium salt type isobutylene-maleic anhydride alternating copolymer;
the curing agent is calcium salt, magnesium salt or zinc salt.
In one embodiment, the present invention provides an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel comprising, in weight percent:
0.2 to 10 percent of sodium alginate, 0.1 to 8 percent of cross-linking agent, 0.5 to 10 percent of curing agent, 0.3 to 8 percent of retarder, 0.2 to 1 percent of preservative and the balance of water.
In another embodiment, the hydrogel comprises, in weight percent:
0.8 to 8 percent of sodium alginate, 0.8 to 6 percent of cross-linking agent, 1.2 to 6 percent of curing agent, 1 to 6 percent of retarder, 0.2 to 1 percent of preservative and the balance of water.
In some embodiments, the curing agent is a calcium salt, a magnesium salt, or a zinc salt, and the calcium salt is one or more of calcium sulfate hemihydrate, calcium sulfate dihydrate, and calcium hydrogen phosphate.
In some embodiments, the set retarder is a phosphate salt, and the phosphate salt is sodium hexametaphosphate, tetrasodium pyrophosphate, sodium tripolyphosphate.
In another embodiment, the present invention provides a method for preparing an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel, comprising the steps of:
(1) preparation of phase a solution: dissolving sodium alginate in appropriate amount of water at room temperature, stirring to dissolve completely to obtain transparent solution;
(2) preparation of B phase solution: dissolving a cross-linking agent in a proper amount of water in a constant-temperature water bath at 60 ℃, stirring the solution to a transparent solution, and cooling the solution to room temperature for later use;
(3) preparation of phase C solution: dissolving the curing agent, the retarder and the preservative with the rest water and stirring uniformly;
(4) mixing the phase solutions A, B and C, pouring into a container, standing and curing.
In another embodiment, the present invention provides a use of an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel in the preparation of an air freshener or facial mask.
In another embodiment, the present invention provides an air freshener or facial mask made from an isobutylene-maleic anhydride alternating copolymer/sodium alginate hydrogel.
In the present invention, sodium alginate reacts chemically with divalent cation ions via two-COO groups adjacent to the polymer chain－The groups forming ionic bridges with cations or passing through-OH groups on each pair of polymer chains-and-COO－The groups and the cations have chelation to form gel; the amide-ammonium salt type isobutene-maleic anhydride alternating copolymer is a high-molecular polymer with neutral pH value of aqueous solution, can be used as adhesive, and has excellent performance, and the aqueous solution of the amide-ammonium salt type isobutene-maleic anhydride alternating copolymer contains-NH2、NH4 +The active groups are added into the sodium alginate solution and then react with-COO in the sodium alginate solution－The groups can also react, so that hydrogel with double network structure such as sodium alginate-calcium ion, sodium alginate-amide-ammonium salt type isobutene-maleic anhydride alternating copolymer can be formed, and the strength, stability and temperature resistance of the hydrogel are greatly improved.
The invention has the following advantages and beneficial effects:
(1) amide-ammonium salt type isobutylene-maleic anhydride alternating copolymer and divalent cations such as calcium salt, magnesium salt or zinc salt are selected to be matched for use to form the hydrogel with a double-network structure, so that the strength, stability and temperature resistance of the hydrogel are improved.
(2) The obtained gel colloid has stable performance, does not melt at the high temperature of 60 ℃, does not precipitate at the low temperature of-20 ℃, has good temperature resistance, and can be widely used in the fields of daily chemical products such as air cleaners or masks and the like.
(3) The reaction condition is mild, the process is simple, the cost is controllable, and the large-scale production can be realized.
The specific implementation mode is as follows:
the hydrogel of the present invention will be described in further detail below, but the present invention is not limited to the following examples.
Example 1:
the embodiment of the invention comprises the following raw materials in percentage by weight:
8 percent of sodium alginate, 4 percent of calcium sulfate hemihydrate, 5 percent of sodium hexametaphosphate, 6 percent of amide-ammonium salt type isobutene-maleic anhydride alternating copolymer, 1.0 percent of preservative and the balance of water.
Example 2:
the embodiment of the invention comprises the following raw materials in percentage by weight:
5.6 percent of sodium alginate, 3.2 percent of calcium sulfate dihydrate, 2.8 percent of sodium tripolyphosphate, 3.2 percent of amide-ammonium salt type isobutene-maleic anhydride alternating copolymer, 0.6 percent of preservative and the balance of water.
Example 3:
the embodiment of the invention comprises the following raw materials in percentage by weight:
2.5 percent of sodium alginate, 1.8 percent of calcium sulfate hemihydrate, 1.6 percent of sodium hexametaphosphate, 1.8 percent of amide-ammonium salt type isobutene-maleic anhydride alternating copolymer, 0.3 percent of preservative and the balance of water.
Example 4:
the embodiment of the invention comprises the following raw materials in percentage by weight:
0.8 percent of sodium alginate, 1.2 percent of calcium hydrophosphate, 1.0 percent of sodium hexametaphosphate, 0.8 percent of amide-ammonium salt type isobutene-maleic anhydride alternating copolymer, 0.2 percent of preservative and the balance of water.
Comparative example 1: the same as in example 1, except that the crosslinker amide-ammonium salt type isobutylene-maleic anhydride alternating copolymer was not added, 10% calcium sulfate hemihydrate was added.
Comparative example 2: the same as in example 1, except that no curing agent calcium sulfate hemihydrate was added, 10% of an amide-ammonium salt type isobutylene-maleic anhydride alternating copolymer was added.
Examples 1 to 4, among others, include the following preparation steps:
(1) preparation of phase a solution: dissolving sodium alginate in appropriate amount of water at room temperature, stirring to dissolve completely to obtain transparent solution;
(2) preparation of B phase solution: dissolving a cross-linking agent in a proper amount of water in a constant-temperature water bath at 60 ℃, stirring the solution to a transparent solution, and cooling the solution to room temperature for later use;
(3) preparation of phase C solution: dissolving the curing agent, the retarder and the preservative with the residual water and stirring uniformly;
(4) mixing the phase solutions A, B and C, pouring into a container, standing and curing.
Comparative example 1 comprises the following preparation steps:
(1) preparation of phase a solution: dissolving sodium alginate in appropriate amount of water at room temperature, stirring to dissolve completely to obtain transparent solution;
(2) preparation of phase C solution: dissolving the curing agent, the retarder and the preservative with the residual water and stirring uniformly;
(3) mixing the phase A and C solutions, pouring into a container, standing and curing.
Comparative example 2 includes the following preparation steps "
(1) Preparation of phase a solution: dissolving sodium alginate in appropriate amount of water at room temperature, stirring to dissolve completely to obtain transparent solution;
(2) preparation of B phase solution: dissolving a cross-linking agent in a proper amount of water in a constant-temperature water bath at 60 ℃, stirring the solution to a transparent solution, and cooling the solution to room temperature for later use;
(3) preparation of phase C solution: dissolving the retarder and the preservative by using the residual water and stirring uniformly;
(4) mixing the phase solutions A, B and C, pouring into a container, standing and curing.
And (3) product performance testing:
a. and (3) testing high-temperature performance:
the samples prepared in the examples and the comparative examples are placed in a 60-degree oven to be heated for 8 hours, the time is recorded, and the stability of the performance of the colloid is observed at three different time points of 1 hour, 4 hours and 8 hours.
b. And (3) low-temperature performance test:
the samples (about 70g) prepared in the examples and the comparative examples are respectively placed in a refrigerator with the temperature of-20 ℃ for freezing for 24 hours, taken out of the refrigerator, thawed to room temperature (about 4 hours), weighed, extruded and poured out if water is separated out from the colloid, weighed again, the water separation amount is calculated, and the water separation rate is calculated according to the following formula.
Water separation rate ═ W0-W1)/W0*100％
In the formula: w0Is an initial weight, W1To remove the precipitated water
The low temperature performance tests of the samples formulated in the examples and comparative examples are shown in the following table:
as can be seen from the above table, the gels obtained in examples 1-4 have stable colloidal properties and low water precipitation rate at high and low temperatures, while comparative examples 1-2 do not contain a cross-linking agent or a curing agent, and the sodium alginate gel has severe water precipitation at low temperatures and a small amount of water precipitation at high temperatures. Therefore, the amide-ammonium salt type isobutylene-maleic anhydride alternating copolymer and divalent cations such as calcium salt, magnesium salt or zinc salt are selected to be matched for use to form the hydrogel with a double-network structure, so that the high and low temperature resistance of the hydrogel is greatly improved.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (1)
1. A method of making a hydrogel, comprising:
the hydrogel comprises the following raw materials in percentage by weight:
5.6 percent of sodium alginate, 3.2 percent of calcium sulfate dihydrate, 2.8 percent of sodium tripolyphosphate, 3.2 percent of amide-ammonium salt type isobutene-maleic anhydride alternating copolymer, 0.6 percent of preservative and the balance of water;
(1) preparation of phase a solution: dissolving sodium alginate in appropriate amount of water at room temperature, stirring to dissolve completely to obtain transparent solution;
(2) preparation of B phase solution: under the water bath with constant temperature of 60 ℃, dissolving the amide-ammonium salt type isobutene-maleic anhydride alternating copolymer in a proper amount of water, stirring the mixture to a transparent solution, and cooling the transparent solution to room temperature for later use;
(3) preparation of phase C solution: dissolving calcium sulfate dihydrate, sodium tripolyphosphate and preservative with the rest water and stirring uniformly;
(4) mixing the phase solutions A, B and C, pouring into a container, standing and curing.
Priority Applications (1)
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