CN115806632A - Preparation method of acidified esterified biodegradable starch - Google Patents
Preparation method of acidified esterified biodegradable starch Download PDFInfo
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- CN115806632A CN115806632A CN202211545674.0A CN202211545674A CN115806632A CN 115806632 A CN115806632 A CN 115806632A CN 202211545674 A CN202211545674 A CN 202211545674A CN 115806632 A CN115806632 A CN 115806632A
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- 229920002472 Starch Polymers 0.000 title claims abstract description 134
- 239000008107 starch Substances 0.000 title claims abstract description 131
- 235000019698 starch Nutrition 0.000 title claims abstract description 131
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000004094 surface-active agent Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 19
- 239000002535 acidifier Substances 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 11
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid ester group Chemical group C(CCCCCCCCCCC)(=O)O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 claims description 32
- 239000005639 Lauric acid Substances 0.000 claims description 16
- 238000005886 esterification reaction Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229920001592 potato starch Polymers 0.000 claims description 14
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 230000003197 catalytic effect Effects 0.000 claims description 9
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims description 8
- 229920002261 Corn starch Polymers 0.000 claims description 7
- 239000008120 corn starch Substances 0.000 claims description 7
- 229940079886 disodium lauryl sulfosuccinate Drugs 0.000 claims description 7
- KHIQYZGEUSTKSB-UHFFFAOYSA-L disodium;4-dodecoxy-4-oxo-3-sulfobutanoate Chemical compound [Na+].[Na+].CCCCCCCCCCCCOC(=O)C(S(O)(=O)=O)CC([O-])=O.CCCCCCCCCCCCOC(=O)C(S(O)(=O)=O)CC([O-])=O KHIQYZGEUSTKSB-UHFFFAOYSA-L 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 7
- 244000017020 Ipomoea batatas Species 0.000 claims description 6
- 235000002678 Ipomoea batatas Nutrition 0.000 claims description 6
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 claims description 5
- 240000003183 Manihot esculenta Species 0.000 claims description 5
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 5
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 229940098779 methanesulfonic acid Drugs 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- 229940100445 wheat starch Drugs 0.000 claims description 3
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims 1
- 230000007613 environmental effect Effects 0.000 abstract 1
- 229920000856 Amylose Polymers 0.000 description 7
- 238000009775 high-speed stirring Methods 0.000 description 7
- 230000020477 pH reduction Effects 0.000 description 5
- KEQGZUUPPQEDPF-UHFFFAOYSA-N 1,3-dichloro-5,5-dimethylimidazolidine-2,4-dione Chemical compound CC1(C)N(Cl)C(=O)N(Cl)C1=O KEQGZUUPPQEDPF-UHFFFAOYSA-N 0.000 description 4
- XTHPWXDJESJLNJ-UHFFFAOYSA-N chlorosulfonic acid Substances OS(Cl)(=O)=O XTHPWXDJESJLNJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000012374 esterification agent Substances 0.000 description 4
- 229920000704 biodegradable plastic Polymers 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000004631 polybutylene succinate Substances 0.000 description 3
- 229920002961 polybutylene succinate Polymers 0.000 description 3
- -1 polybutylene terephthalate-adipate Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229920000881 Modified starch Polymers 0.000 description 2
- 239000004368 Modified starch Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006065 biodegradation reaction Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 235000019426 modified starch Nutrition 0.000 description 2
- 125000005489 p-toluenesulfonic acid group Chemical group 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- 239000004632 polycaprolactone Substances 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000005014 poly(hydroxyalkanoate) Substances 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229940083575 sodium dodecyl sulfate Drugs 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Abstract
The invention discloses a preparation method of acidified esterified biodegradable starch, which is prepared from the following raw materials in percentage by weight: 75-95% of dry starch, 1-3% of acidifier, 5-20% of esterifying agent and 0.5-1.5% of surfactant. The biodegradable starch prepared by the invention has the characteristics of good biodegradability and environmental friendliness.
Description
Technical Field
The invention relates to the technical field of modified starch, in particular to a preparation method of acidified esterified biodegradable starch.
Background
Natural starch is a renewable resource, has many varieties, wide sources and low price, and is widely used for preparing biodegradable plastic products, but the natural starch is a strong-polarity crystalline substance, has a molecular structure rich in hydroxyl, has the defects of low reaction activity, a large amount of hydrogen bonds among molecules, easiness in water absorption, extremely poor plasticity, difficulty in molding and processing and the like, and therefore physical or chemical modification needs to be carried out on the natural starch to destroy the crystalline structure and improve the compatibility and the processing performance of the natural starch with plastics.
The acidified esterified modified starch has the advantages of good operability and high production efficiency, can be compounded with various materials such as polybutylene terephthalate-adipate (PBAT), polylactic acid (PLA), polybutylene succinate (PBS), polycaprolactone (PCL), polyhydroxyalkanoate (PHA) and the like, and can be used for industrially preparing biodegradable plastic products.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the performance deficiency of the existing natural starch, the chemical method is adopted to modify the natural starch, and the acidified esterified biodegradable starch is provided.
The technical scheme of the invention is as follows:
the acidified esterified biodegradable starch is prepared from the following raw materials in percentage by weight: 75-95% of dry starch, 1-3% of acidifier, 5-20% of esterifying agent and 0.5-1.5% of surfactant.
The dry starch is obtained by drying natural starch such as corn starch, cassava starch and the like at 100 ℃ and under the vacuum degree of 80-100KPa for 4-6h until the water content is less than or equal to 1.5%.
Preferably, the acidifying agent is one of concentrated sulfuric acid, methanesulfonic acid, dodecylbenzenesulfonic acid and p-toluenesulfonic acid.
Preferably, the esterifying agent is lauric acid and derivatives thereof.
Preferably, the surfactant is one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and disodium lauryl sulfosuccinate monoester.
The preparation method of the acidified esterified biodegradable starch comprises the following steps:
step 1: drying natural starch at 80-100 deg.C under 80-100KPa vacuum condition for 4-6 hr to remove water absorbed by the starch until the water content is less than or equal to 1.5% to obtain dry starch;
the natural starch is corn starch, wheat starch, cassava starch, potato starch, sweet potato starch and potato starch.
Step 2: stirring and acidifying the dry starch and 1-3% of acidifying agent at 30-60 deg.C and 400-800r/min for 0.5-1.5 hr to obtain acidified starch;
the acidifier is one of concentrated sulfuric acid, methanesulfonic acid, chlorosulfonic acid, trifluoromethanesulfonic acid, dodecylbenzenesulfonic acid and p-toluenesulfonic acid, hydrogen bonds are formed between-OH in the acidifier and-OH in dry starch, so that hydrogen bonds among starch molecules are weakened or destroyed, the crystallinity of natural starch is reduced, and the starch-OH is activated to increase the reaction activity;
preferably, the mass fraction of the concentrated sulfuric acid is 98%.
And 3, step 3: simultaneously adding 5-20% of esterifying agent and 0.5-1.5% of surfactant into the acidified starch, and carrying out high-speed stirring and catalytic esterification reaction for 0.5-2h under the vacuum conditions of temperature controlled at 100-120 ℃, rotation speed of 900-1500r/min and 80-100KPa to prepare the acidified esterified biodegradable starch;
preferably, the surfactant is one of sodium dodecyl sulfate, sodium dodecyl sulfate and disodium lauryl sulfosuccinate monoester.
The natural starch structurally contains polyhydroxy, and can be modified through functional group reaction, wherein the hydroxyl is replaced by a long chain, a hydrophobic organic carbon chain is introduced, the intermolecular force of the starch is weakened, and the water resistance of the starch can be improved, the water absorption and brittleness of a starch material can be relieved, and the thermoplasticity and hydrophobicity of the starch can be improved by modifying the starch through an acidification esterification method.
The final products of the degradation of the acidified esterified biodegradable starch are water and carbon dioxide, the biodegradation performance is good, no pollution is caused, and the acidified esterified biodegradable starch can replace part of plastics to be applied to many occasions, such as the fields of agriculture, food containers, hospital packaging and the like.
In conclusion, the invention has the following beneficial effects:
1. according to the preparation method of the acidified esterified starch disclosed by the invention, the natural starch is dried in vacuum, then inorganic acid or organic acid is added, and the acidification treatment is carried out by stirring at a low temperature and a low speed, so that the acidification and activation treatment of-OH of the dry starch can be realized, the esterification reaction activity of the dry starch is improved, and the subsequent esterification reaction can be favorably carried out.
2. The acidified starch is further subjected to catalytic esterification reaction to prepare acidified esterified biodegradable starch, the use of the surfactant is favorable for full esterification reaction, and the reaction time is shortened.
3. The acidified esterified starch can be compounded with various resins such as PLA, PBAT, PBS and the like, is environment-friendly and pollution-free, has good physical, chemical and biological degradation performances, and can effectively reduce the cost of biodegradable plastic products.
Detailed Description
The most key concept of the invention is as follows: the invention adopts cheap and easily available natural starch as a raw material, and adopts an acidifying agent, a surfactant and an esterifying agent to carry out acidification and esterification reaction on dry starch, thereby destroying the structure of the starch and improving the thermoplastic processing performance and the biodegradation performance of the starch.
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
Example 1
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
76% dry starch, 2.5% acidulant, 20% esterification agent, 1.5% surfactant:
wherein the dry starch is corn starch, and the amylose content is 22-28%.
Wherein the acidifying agent is concentrated sulfuric acid; the esterifying agent is lauric acid; the surfactant is sodium dodecyl sulfate.
The mass fraction of the concentrated sulfuric acid is 98%.
The method comprises the following implementation steps:
step 1: drying corn starch at 80 deg.C under 80KPa vacuum condition for 6 hr to water content of 0.6% to obtain dry starch.
Step 2: and (3) stirring and acidifying dry starch and 98% concentrated sulfuric acid at a low speed for 1.5h at the temperature of 30 ℃ and the rotating speed of 420r/min to obtain acidified starch.
And step 3: adding the lauric acid and the sodium dodecyl sulfate into the acidified starch at the same time, controlling the temperature to 100 ℃, the rotating speed to 950r/min, and carrying out high-speed stirring and catalytic esterification reaction for 2 hours under the vacuum condition of 80KPa to prepare the acidified esterified biodegradable starch.
Example 2
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
85% dry starch, 1% acidulant, 13% esterifying agent, 1% surfactant:
wherein the dry starch is tapioca starch and the amylose content is about 17%.
Wherein the acidifying agent is trifluoromethanesulfonic acid; the esterifying agent is lauric acid; the surfactant is sodium dodecyl sulfate.
The realization steps are as follows:
step 1: drying the cassava starch at 90 ℃ under 85KPa vacuum condition for 5.5h until the water content is 0.8% to obtain the dry starch.
Step 2: and (3) stirring and acidifying dry starch and trifluoromethanesulfonic acid at a low speed for 1.2 hours at the temperature of 35 ℃ and the rotation speed of 450r/min to obtain acidified starch.
And step 3: adding the lauric acid and the sodium dodecyl sulfate into the acidified starch at the same time, controlling the temperature to 105 ℃, the rotating speed to 1250r/min, and carrying out high-speed stirring and catalytic esterification reaction for 1.8h under the vacuum condition of 95KPa to prepare the acidified esterified biodegradable starch.
Example 3
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
87.5% dry starch, 2% acidulant, 10% esterification agent, 0.5% surfactant:
wherein the dry starch is wheat starch, and the amylose content is about 20%.
Wherein the acidifying agent is p-toluenesulfonic acid; the esterifying agent is lauric acid; the surfactant is sodium dodecyl benzene sulfonate.
The method comprises the following implementation steps:
step 1: drying corn starch at 100 deg.C under 100KPa vacuum condition for 4 hr to water content of 1.3% to obtain dry starch.
Step 2: and (3) stirring and acidifying the dry starch and p-toluenesulfonic acid at a low speed for 1h at the temperature of 45 ℃ and the rotating speed of 550r/min to obtain acidified starch.
And 3, step 3: adding the lauric acid and the sodium dodecyl benzene sulfonate into the acidified starch at the same time, controlling the temperature to 120 ℃, the rotating speed to 1050r/min, and carrying out high-speed stirring and catalytic esterification reaction for 0.5h under the vacuum condition of 88KPa, thus obtaining the acidified esterified biodegradable starch.
Example 4
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
82% dry starch, 1.8% acidulant, 15% esterification agent, 1.2% surfactant:
wherein the dry starch is potato starch, and amylose content is 17-25%.
Wherein the acidifying agent is dodecylbenzene sulfonic acid; the esterifying agent is lauric acid; the surfactant is disodium lauryl sulfosuccinate.
The realization steps are as follows:
step 1: drying potato starch at 95 deg.C under 85KPa vacuum for 5 hr to water content of 1.1% to obtain dry starch.
Step 2: stirring and acidifying dry starch and dodecyl benzene sulfonic acid at a low speed for 0.5h at the temperature of 50 ℃ and the rotating speed of 800r/min to obtain the acidified starch.
And 3, step 3: adding the lauric acid and the disodium lauryl sulfosuccinate into the acidified starch at the same time, and carrying out high-speed stirring and catalytic esterification reaction for 1.8 hours under the vacuum conditions of the temperature controlled to be 115 ℃, the rotating speed of 1200r/min and 100KPa to prepare the acidified esterified biodegradable starch.
Example 5
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
79.5% dry starch, 1.5% acidulant, 18% esterifying agent, 1% surfactant:
wherein the dry starch is sweet potato starch, and the amylose content is 16%.
Wherein the acidifier is chlorosulfonic acid; the esterifying agent is lauric acid; the surfactant is disodium lauryl sulfosuccinate.
The realization steps are as follows:
step 1: drying sweet potato starch at 90 deg.C under 95KPa vacuum condition for 4.5 hr to water content of 0.5% to obtain dry starch.
Step 2: stirring and acidifying dry starch and chlorosulfonic acid at low speed for 1.2h at the temperature of 60 ℃ and the rotating speed of 650r/min to obtain the acidified starch.
And 3, step 3: adding the lauric acid and the disodium lauryl sulfosuccinate into the acidified starch at the same time, and carrying out high-speed stirring and catalytic esterification reaction for 2 hours under the vacuum conditions of the temperature controlled to 105 ℃, the rotating speed 1350r/min and 90KPa to prepare the acidified esterified biodegradable starch.
Example 6
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
90.5% dry starch, 3% acidulant, 5% esterifying agent, 1.5% surfactant:
wherein the dry starch is sweet potato starch, and the amylose content is 18%.
Wherein the acidifying agent is methanesulfonic acid; the esterifying agent is lauric acid; the surfactant is sodium dodecyl sulfate.
The method comprises the following implementation steps:
step 1: drying sweet potato starch at 88 deg.C under 86KPa vacuum condition for 5.5 hr to water content of 0.8% to obtain dry starch.
Step 2: stirring and acidifying dry starch and chlorosulfonic acid at low speed for 1.5h at 35 ℃ and 720r/min to obtain acidified starch.
And 3, step 3: adding the lauric acid and the sodium dodecyl sulfate into the acidified starch at the same time, and stirring at a high speed for catalyzing esterification reaction for 1.6 hours under the vacuum conditions of temperature controlled to 110 ℃, rotating speed 950r/min and 86KPa to prepare the acidified esterified biodegradable starch.
Example 7
The acidified esterified biodegradable starch comprises the following raw materials in percentage by weight:
89.5% dry starch, 1.3% acidulant, 8% esterification agent, 1.2% surfactant:
wherein the dry starch is potato starch, and the amylose content is 18-25%.
Wherein the acidifying agent is p-toluenesulfonic acid; the esterifying agent is lauric acid; the surfactant is sodium dodecyl sulfate.
The method comprises the following implementation steps:
step 1: drying potato starch at 98 deg.C under 93KPa vacuum condition for 4.5 hr to water content of 0.9% to obtain dry starch.
And 2, step: and (3) stirring and acidifying the dry starch and p-toluenesulfonic acid at a low speed for 0.8h at a temperature of 60 ℃ and a rotating speed of 760r/min to obtain acidified starch.
And step 3: adding the lauric acid and the sodium dodecyl sulfate into the acidified starch at the same time, controlling the temperature to be 115 ℃, the rotating speed to 1450r/min, and carrying out high-speed stirring and catalytic esterification reaction for 2 hours under the vacuum condition of 95KPa to prepare the acidified esterified biodegradable starch.
Comparative example
Drying corn starch at 80 ℃ under 80KPa vacuum condition for 6h until the water content is 0.6% to obtain dry starch, then directly mixing the dry starch with PBAT according to the mass ratio of 1: 1 without acidification and esterification modification, and banburying by using a torque rheometer under the banburying condition of 160 ℃ for 300s.
The performance tests of the acidified esterified biodegradable starch prepared in the above comparative examples and examples:
(1) Performance test method
And (2) carrying out internal mixing on the acidified esterified biodegradable starch and the PBAT according to the mass ratio of 1: 1 by using a torque rheometer, wherein the internal mixing condition is 160 ℃ for 300s. The 180d biological decomposition rate is tested by adopting ISO 14855-1; the tensile strength is tested according to GB/T1040.1-2018; the notched impact strength was tested in accordance with GB/T1043.1-2008.
(2) The results of the testing are given in the following table
The above examples are illustrative and not restrictive, and any insubstantial modifications of the inventive process concepts and solutions, or their direct application to other applications without modification, are intended to be within the scope of the present invention.
Claims (7)
1. The acidified esterified biodegradable starch is characterized by being prepared from the following raw materials in percentage by weight: 75-95% of dry starch, 1-3% of acidifier, 5-20% of esterifying agent and 0.5-1.5% of surfactant.
2. The acidified esterified biodegradable starch according to claim 1, wherein the process for the preparation of acidified esterified biodegradable starch comprises the steps of:
step 1: drying natural starch at 80-100 deg.C under vacuum condition of 80-100KPa for 4-6 hr to water content of less than or equal to 1.5% to obtain dry starch;
and 2, step: stirring and acidifying the dry starch and 1-3% acidifying agent at 30-60 deg.C and rotation speed of 400-800r/min at low speed for 0.5-1.5 hr to obtain acidified starch;
and step 3: simultaneously adding 5-20% of esterifying agent and 0.5-1.5% of surfactant into the acidified starch, controlling the temperature to 100-120 ℃, stirring at high speed of 900-1500r/min under the vacuum condition of 80-100KPa, and carrying out catalytic esterification reaction for 0.5-2h to obtain the acidified esterified biodegradable starch.
3. The acidified esterified biodegradable starch of claim 2 wherein the native starch is one of corn starch, wheat starch, tapioca starch, potato starch, sweet potato starch, potato starch.
4. The acidified esterified biodegradable starch of claim 1 wherein the acidifying agent is one of concentrated sulfuric acid, methanesulfonic acid, dodecylbenzenesulfonic acid, p-toluenesulfonic acid.
5. The acidified esterified biodegradable starch of claim 1 wherein the surfactant is one of sodium lauryl sulfate, sodium dodecylbenzene sulfonate, disodium lauryl sulfosuccinate monoester.
6. The acidified esterified biodegradable starch according to claim 1 wherein the esterifying agent is lauric acid and derivatives thereof.
7. Process for the preparation of an acidified esterified biodegradable starch according to any one of claims 1 to 6, comprising the steps of: putting natural starch into a vacuum drier for drying, adding an acidifying agent into a stirrer for acidifying for 0.5-1.5h, adding the surfactant and an esterifying agent, and reacting for 0.5-2h to obtain the acidified esterified biodegradable starch.
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