CN101117442A - Grain protein/hydrotalcite nano composite material and method for making same - Google Patents
Grain protein/hydrotalcite nano composite material and method for making same Download PDFInfo
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- CN101117442A CN101117442A CNA2007100701266A CN200710070126A CN101117442A CN 101117442 A CN101117442 A CN 101117442A CN A2007100701266 A CNA2007100701266 A CN A2007100701266A CN 200710070126 A CN200710070126 A CN 200710070126A CN 101117442 A CN101117442 A CN 101117442A
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Abstract
The invention discloses a cereal protein/hydrotalcite nanometer composite material and the method of preparation thereof, wherein the cereal protein/hydrotalcite nanometer composite material comprises 100 parts by weight of cereal protein, 5 to 20 parts by weight of layered nanometer hydrotalcite, 10 to 40 parts by weight of plasticizer and 1 to 10 parts by weight of stearic acid; the method of preparation is as follows: suspension prepared by the hydrotalcite and the stearic acid is added into the alkaline aqueous solution of the cereal protein; water is removed through centrifugal separation under the condition that pH value ranges from 5 to 7, and then the plasticizer is added; finally, the cereal protein/hydrotalcite nanometer composite material can be obtained after drying, and mold pressing method is adopted to prepare the composite material with outstanding mechanical property. The major raw material, cereal protein involved in the invention belongs to renewable agricultural resource and has extensive sources; meanwhile, the cereal protein/ nano-particle in-situ composite has simple preparation method and technical process and low production cost and is easy to popularize and implement.
Description
Technical field
The present invention relates to a kind of grain protein/houghite nano composite material and preparation method thereof.
Background technology
Our times plastics ultimate production surpasses 1.7 hundred million tons, has been penetrated into the every field of national economy all departments and people's lives.Serious day by day along with the in short supply day by day of petroleum resources and environmental pollution that synthesized polymer material caused, with renewable, degradable plant resource as industrial chemicals, more and more paid much attention to, become one of field, forward position of polymer material science and process engineering.
Corn protein is the byproduct of starch industry, and is main at present as fodder additives, and part is used for food improver or produces flavor peptides, amino acid.Adopting corn protein to prepare degradable plastics is one of effective way that improves its added value, alleviation white pollution.The mechanical property of corn protein plastics is relatively poor, needs to wait rigidity, thermotolerance and the water tolerance that improves material through uv irradiation, gamma-radiation irradiation, enzyme processing or chemically crosslinked.Chinese patent application number 200610018518.3 " soy-protein/aluminium hydrate nano composite materials and its production and use " disclose the employing nano-aluminum hydroxide and have improved soybean protein material intensity and inflexible method, soy-protein is scattered in the aluminum chloride aqueous solution, adopt ammoniacal liquor and aluminium reaction to form the gel mixture, obtain to extrude the soy-protein/aluminium hydrate nano mixture of processing after drying.Chinese patent application number 200610018519.8 " a kind of nanometer composite materials with soya protein and montmorillonite and its production and use " disclose the employing nano imvite and have improved soybean protein material intensity, rigidity and stable on heating method, with soy proteinaceous aqeous suspension mixes with the aqeous suspension of polynite, centrifugal, wash, drying and acquisition soya protein and montmorillonite nano-complex.Yet grain protein such as aleuronat contain the gluten of toughness prolamine and heavy molecular weight, in case aquation promptly forms the dough of high viscosity, even also be difficult to form suspension under the lower situation of concentration.Thereby, when adopting suspension method to prepare the grain protein nano composite material, be difficult to guarantee the homodisperse of nanoparticle in mixture.The ethanol/water solution of employing gluten powders such as Olabarrieta and the alcohol suspension of polynite blended method mutually prepare gluten powder/montmorillonite Composite film (Olabarrieta I, Gallstedt M, Ispizua I, Sarasua J-R, Hedenqvist MS, Properties of agedmontmorillonite-wheat gluten composite films.Journal of Agriculture and FoodChemistry, 2006,54,1283-1288), find that polynite can increase substantially the moisture barrier characteristics of aleuronat.
Summary of the invention
The purpose of this invention is to provide a kind of grain protein/houghite nano composite material and preparation method thereof.
Consisting of of grain protein/houghite nano composite material: grain protein 100 weight parts, laminar nano hydrotalcite 5～20 weight parts, softening agent 10～40 weight parts, stearic acid 1～10 weight part.
The preparation method of grain protein/houghite nano composite material: at first grain protein is joined weight percent concentration and be in 10～25% the ammoniacal liquor, the amount of being made into percentage concentration is 5～20% grain protein solution, add the laminar nano hydrotalcite then, laminar nano hydrotalcite weight is 5～20% of grain protein weight, add stearic acid again, stearic acid weight is 1～10% of grain protein weight, ultra-sonic dispersion 1～3h, transfer pH to 5～7, moisture is removed in centrifugation, deionization washing 3～5 times adds softening agent at last, and softening agent weight is 10～40% of grain protein weight, mix, dry under 50～80 ℃ of temperature, hot pressing 10～30min under 100～140 ℃ of temperature obtains grain protein/houghite nano composite material goods.
Described grain protein is gluten powder, rice protein powder, wheat gliadin, hordein, zein or kafirin.Softening agent is glycerine or trolamine.
Advantage of the present invention is:
1) the direct disperse water talcum of ammonia solution of employing grain protein, the amido on the protein molecule chain, carboxyl etc. interact by hydrogen bond with the hydrotalcite active group, and hydrotalcite suspension is had stabilization, can effectively suppress the reunion of hydrotalcite particle;
2) under strong alkaline condition, stearic acid can carry out hydrophobically modified to hydrotalcite, and promotes the intercalation modifying of protein molecule in hydrotalcite layers;
3) grain protein/houghite nano composite material has excellent moulding processability, can adopt compression molding to prepare crosslinked products.
Embodiment
The preparation of grain protein/nanoparticle original position mixture is a key of the present invention.The present invention adopts alkaline solution to dissolve grain protein first, and the protein soln of compounding high concentration adds successively that an amount of laminar nano hydrotalcite drips, stearic acid, and ultra-sonic dispersion 1～3h obtains high stability suspension system.Behind the adjust pH 5～7, protein precipitates.Adopt centrifugal separation to remove moisture, deionization washing 3～5 times adds an amount of softening agent then, mixes back drying under 50～80 ℃ of conditions, promptly obtains grain protein/houghite nano composite material.
Above-mentioned grain protein/nanoparticle original position mixture can adopt the conventional direct compression molding of vulcanizing press, and molding temperature is advisable with 100～140 ℃.In this temperature range, protein molecule forms network structure by intermolecular disulfide bond.
Preparation technology of the present invention does not change the molecular structure of grain protein, and the grain protein/Nano particle composite material in situ that is obtained is implemented crosslinked by disulfide linkage between protein molecule.Under field conditions (factors), these disulfide linkage can rupture, and protein molecule can be hydrolyzed to amino acid.Thereby the grain protein/Nano particle composite material in situ that is obtained can be degraded fully, and its resistates hydrotalcite is harmless fully to environment.
Further specify the present invention below in conjunction with specific embodiment.
Embodiment 1:
Taking by weighing the 10g gluten powder, to add 190g concentration be in 10% the ammoniacal liquor, be made into protein concn and be 5% solution, add 0.5g hydrotalcite, 0.1g stearic acid, ultra-sonic dispersion 1h, transfer pH to 5 with 10% hydrochloric acid, moisture is removed in centrifugation, deionization washing 3 times, add 1g glycerine then, remove moisture at 50 ℃ of dry 48h after stirring, place GB/T1040-92 plastic tensile performance test Standard Module,, obtain grain protein/Nano particle composite material in situ goods at 140 ℃ of hot pressing 10min.
Embodiment 2～5:
The hydrotalcite consumption is respectively 1g, 1.5g, 2g, and all the other conditions are with embodiment 1.
Embodiment 6:
Taking by weighing the 10g rice protein powder, to add 40g concentration be in 25% the ammoniacal liquor, be made into protein concn and be 20% solution, add 2g hydrotalcite, 1g stearic acid, ultra-sonic dispersion 3h, transfer pH to 7 with 10% hydrochloric acid, moisture is removed in centrifugation, deionization washing 5 times, add the 4g trolamine, remove moisture at 80 ℃ of dry 48h after stirring, place GB/T1040-92 plastic tensile performance test Standard Module,, obtain grain protein/Nano particle composite material in situ goods at 100 ℃ of hot pressing 30min.
Embodiment 7～10:
Replace rice protein powder with wheat gliadin, hordein, zein or kafirin respectively, all the other conditions are with embodiment 6.
The comparative example 1:
Except that adding hydrotalcite, all the other conditions are with embodiment 1.
Table 1 has compared Young's modulus, tensile strength and the elongation at break of embodiment 1～5, comparative example 1 sample that obtains.Experiment adopts CMT-4204 universal testing machine (material tests company limited is newly thought carefully in Shenzhen) at room temperature and 10mm min with reference to the GB/T1040-92 standard
-1Carry out under the speed, get 3 sample test results' mean value.
The mechanical property of table 1 grain protein/houghite nano composite material
| Young's modulus (MPa) | Tensile strength (MPa) | Elongation at break (%) | |
| The comparative example 1 | 40.4±1.6 | 3.1±0.2 | 112±6 |
| Embodiment 1 | 42.7±4.4 | 3.5±0.3 | 120±8 |
| Embodiment 2 | 50.5±2.4 | 4.8±0.5 | 103±10 |
| Embodiment 3 | 67.0±1.1 | 5.2±0.1 | 88±6 |
| Embodiment 4 | 62.6±0.8 | 6.6±0.3 | 74±6 |
| Embodiment 5 | 77.8 | 5.6±0.4 | 52±7 |
The invention provides a kind of grain protein/houghite nano composite material and preparation method thereof.Main raw material grain protein involved in the present invention belongs to renewable agricultural resource, wide material sources; The preparation method and the technical process of grain protein/houghite nano composite material involved in the present invention are simple, and low production cost is easy to promotion and implementation.Grain protein/the hydrotalcite nano that makes based on the present invention has excellent mechanics, and protein can be degraded its residue hydrotalcite environmental sound under field conditions (factors) fully.
Claims (6)
1. a grain protein/houghite nano composite material is characterized in that, it consist of: grain protein 100 weight parts, laminar nano hydrotalcite 5～20 weight parts, softening agent 10～40 weight parts, stearic acid 1～10 weight part.
2. grain protein/houghite nano composite material according to claim 1 is characterized in that, described grain protein is gluten powder, rice protein powder, wheat gliadin, hordein, zein or kafirin.
3. grain protein/houghite nano composite material according to claim 1 is characterized in that, described softening agent is glycerine or trolamine.
4. the preparation method of a grain protein/houghite nano composite material as claimed in claim 1, it is characterized in that, at first grain protein is joined weight percent concentration and be in 10～25% the ammoniacal liquor, the amount of being made into percentage concentration is 5～20% grain protein solution, add the laminar nano hydrotalcite then, laminar nano hydrotalcite weight is 5～20% of grain protein weight, add stearic acid again, stearic acid weight is 1～10% of grain protein weight, and ultra-sonic dispersion 1～3h transfers pH to 5～7, moisture is removed in centrifugation, deionization washing 3～5 times adds softening agent at last, and softening agent weight is 10～40% of grain protein weight, mix, dry under 50～80 ℃ of temperature, hot pressing 10～30min under 100～140 ℃ of temperature obtains grain protein/houghite nano composite material goods.
5. the preparation method of grain protein/houghite nano composite material according to claim 4, it is characterized in that described grain protein is gluten powder, rice protein powder, wheat gliadin, hordein, zein or kafirin.
6. the preparation method of grain protein/houghite nano composite material according to claim 4 is characterized in that, described softening agent is glycerine or trolamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100701266A CN101117442A (en) | 2007-07-20 | 2007-07-20 | Grain protein/hydrotalcite nano composite material and method for making same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100701266A CN101117442A (en) | 2007-07-20 | 2007-07-20 | Grain protein/hydrotalcite nano composite material and method for making same |
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| Publication Number | Publication Date |
|---|---|
| CN101117442A true CN101117442A (en) | 2008-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100701266A Pending CN101117442A (en) | 2007-07-20 | 2007-07-20 | Grain protein/hydrotalcite nano composite material and method for making same |
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| Country | Link |
|---|---|
| CN (1) | CN101117442A (en) |
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2007
- 2007-07-20 CN CNA2007100701266A patent/CN101117442A/en active Pending
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Open date: 20080206 |