CN116574313A - Waterproof starch-based straw and preparation method thereof - Google Patents
Waterproof starch-based straw and preparation method thereof Download PDFInfo
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- CN116574313A CN116574313A CN202310605780.1A CN202310605780A CN116574313A CN 116574313 A CN116574313 A CN 116574313A CN 202310605780 A CN202310605780 A CN 202310605780A CN 116574313 A CN116574313 A CN 116574313A
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- 239000010902 straw Substances 0.000 title claims abstract description 91
- 229920002472 Starch Polymers 0.000 title claims abstract description 83
- 235000019698 starch Nutrition 0.000 title claims abstract description 83
- 239000008107 starch Substances 0.000 title claims abstract description 83
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 23
- 239000003549 soybean oil Substances 0.000 claims abstract description 23
- -1 alkenyl succinic anhydride Chemical compound 0.000 claims abstract description 11
- 229940014800 succinic anhydride Drugs 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000001035 drying Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 15
- 238000001125 extrusion Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- WVRNUXJQQFPNMN-VAWYXSNFSA-N 3-[(e)-dodec-1-enyl]oxolane-2,5-dione Chemical group CCCCCCCCCC\C=C\C1CC(=O)OC1=O WVRNUXJQQFPNMN-VAWYXSNFSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 229920002261 Corn starch Polymers 0.000 claims description 7
- 239000008120 corn starch Substances 0.000 claims description 7
- 239000002585 base Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- 125000003342 alkenyl group Chemical group 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000004593 Epoxy Substances 0.000 abstract description 15
- 230000002209 hydrophobic effect Effects 0.000 abstract description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 7
- 238000005886 esterification reaction Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- OYHQOLUKZRVURQ-HZJYTTRNSA-M 9-cis,12-cis-Octadecadienoate Chemical compound CCCCC\C=C/C\C=C/CCCCCCCC([O-])=O OYHQOLUKZRVURQ-HZJYTTRNSA-M 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 4
- IPCSVZSSVZVIGE-UHFFFAOYSA-M hexadecanoate Chemical compound CCCCCCCCCCCCCCCC([O-])=O IPCSVZSSVZVIGE-UHFFFAOYSA-M 0.000 abstract description 4
- 229940049918 linoleate Drugs 0.000 abstract description 4
- 229940049964 oleate Drugs 0.000 abstract description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 abstract description 4
- 125000003700 epoxy group Chemical group 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- QDCPNGVVOWVKJG-VAWYXSNFSA-N 2-[(e)-dodec-1-enyl]butanedioic acid Chemical compound CCCCCCCCCC\C=C\C(C(O)=O)CC(O)=O QDCPNGVVOWVKJG-VAWYXSNFSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- AAHZZGHPCKJNNZ-UHFFFAOYSA-N Hexadecenylsuccinicacid Chemical compound CCCCCCCCCCCCCCC=CC(C(O)=O)CC(O)=O AAHZZGHPCKJNNZ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000032050 esterification Effects 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- RSPWVGZWUBNLQU-FOCLMDBBSA-N 3-[(e)-hexadec-1-enyl]oxolane-2,5-dione Chemical compound CCCCCCCCCCCCCC\C=C\C1CC(=O)OC1=O RSPWVGZWUBNLQU-FOCLMDBBSA-N 0.000 description 1
- 244000241838 Lycium barbarum Species 0.000 description 1
- 235000015459 Lycium barbarum Nutrition 0.000 description 1
- 235000015468 Lycium chinense Nutrition 0.000 description 1
- 240000003183 Manihot esculenta Species 0.000 description 1
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 125000005066 dodecenyl group Chemical group C(=CCCCCCCCCCC)* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 235000012171 hot beverage Nutrition 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004078 waterproofing Methods 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
- C08L3/06—Esters
-
- 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
- C08B31/02—Esters
- C08B31/04—Esters of organic acids, e.g. alkenyl-succinated starch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/06—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The application belongs to the technical field of starch-based straw development, and particularly relates to a waterproof starch-based straw and a preparation method thereof. On one hand, epoxy groups on the molecular structure of the epoxidized soybean oil react with starch molecular hydroxyl groups to destroy the crystal structure of starch, so that alkenyl succinic anhydride can enter the starch particles to react with the starch molecular hydroxyl groups, and hydrophobic group alkenyl long chains are introduced into the starch molecules through esterification reaction to enhance the waterproof capability of the suction pipe; on the other hand, the introduction of hydrophobic carbon chains on molecular structures such as epoxy linoleate, epoxy oleate and epoxy palmitate in the epoxidized soybean oil can reduce the sensitivity of the straw to moisture and further improve the waterproof performance of the starch-based straw.
Description
Technical Field
The application belongs to the technical field of starch-based straw development, and particularly relates to a waterproof starch-based straw and a preparation method thereof.
Background
With the development of technology, plastic straws are widely used. At present, most of plastic straws sold on the market use petroleum-based raw materials PE or PP as a base material, but the PE/PP-based straws are difficult to decompose under natural conditions, and the safety of the PE/PP-based straws when used in the food industry is still under question. Therefore, the development of environmentally friendly pipettes derived from renewable resources has become one of the research hotspots in the straw product industry. Starch is considered by people as one of the most potential natural biodegradable materials for its renewable, abundant and full degradation. However, the existing starch-based straw generally has the problems of poor waterproof performance, poor foam resistance and the like, and particularly when the starch-based straw is applied to hot drinks, the starch-based straw is easy to absorb water and soften, so that the usability is lost.
Chinese patent CN 115746406A provides a starch straw and a preparation method thereof, wherein common starch is used as a raw material, glycerol is used as a plasticizer, and the starch straw with high water resistance and excellent mechanical property is obtained by ageing a semi-finished starch straw, so that hydroxyl groups on a starch chain are mutually associated through hydrogen bond interaction and rearranged to form a plurality of ordered crystal structures with low energy states. However, the mechanical properties are considered, and the mechanical properties of the suction tube after water absorption are measured; chinese patent CN 112220319A provides an edible straw for wolfberry and its processing method, which is prepared by adsorbing waterproof glue on the surface, and emphasizes the edibility of the raw material; the strength after water absorption and the edibility are the subjects of the above-mentioned proposal, and the hydrophobicity of the present application has not been studied. In consideration of the fact that starch exhibits stronger water absorption due to the polyhydroxy nature of the starch, the introduction of hydrophobic groups on starch molecules to block the contact of the starch molecules with water is a realistic and feasible method for preparing the waterproof starch-based straw.
Disclosure of Invention
Aiming at the problems in the research of hydrophobicity or waterproofness of the starch-based straw at the present stage, the application provides a waterproof starch-based straw, which is characterized in that on one hand, epoxy groups on the molecular structure of epoxy soybean oil react with starch molecular hydroxyl groups to destroy the crystal structure of starch, alkenyl succinic anhydride is beneficial to enter the starch particles to react with the starch molecular hydroxyl groups, and hydrophobic group alkenyl chains are introduced into the starch molecules through esterification reaction to enhance the waterproof capability of the straw; on the other hand, the introduction of hydrophobic carbon chains on molecular structures such as epoxy linoleate, epoxy oleate and epoxy palmitate in the epoxidized soybean oil can reduce the sensitivity of the straw to moisture and further improve the waterproof performance of the starch-based straw.
The technical scheme of the application is as follows:
a waterproof starch-based straw comprises the following raw materials, by taking 100g of starch as a reference, 2.5-8.5% of alkenyl succinic anhydride, 0.4-0.6% of strong alkali, 2-5% of epoxidized soybean oil and 25-35% of water.
Preferably, the starch is corn starch.
Preferably, the number of alkenyl chains C in the alkenyl succinic anhydride is 12 or more.
Preferably, the alkenyl succinic anhydride is dodecenyl succinic anhydride.
Preferably, the strong base is sodium hydroxide or/and potassium hydroxide.
The preparation method of the waterproof starch-based straw comprises the following steps:
(1) Mixing the raw materials: starch, alkenyl succinic anhydride and strong alkali dissolved in water are stirred and mixed uniformly at a low speed, and then water and epoxidized soybean oil are added for rapid stirring; mixing, bagging, and standing;
(2) Extrusion construction of starch-based straws: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, setting extrusion parameters of an extruder, and extruding through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device with a fan, and cutting after cooling;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven, and drying to obtain the waterproof starch-based straw.
Preferably, the low-speed stirring conditions in the step (1) are as follows: the rotating speed is 150-300rpm, and the stirring time is 5-10min; the rapid stirring conditions are as follows: the rotation speed is 360-600rpm, and the stirring time is 5-10min.
Preferably, the extruder extrusion parameters described in step (2) are: the rotating speed of the feeding screw is 24-60rpm; extruder set screw speed 60-240rpm, extruder set heating unit one zone to four zone temperature: 40-55deg.C, 55-65deg.C, 85-115 deg.C, and 80-105deg.C.
The epoxy soybean oil adopted by the application has the advantages that epoxy groups on the molecular structure can react with starch molecular hydroxyl groups to destroy the crystal structure of starch, so that alkenyl succinic anhydride can enter the starch particles to react with the starch molecular hydroxyl groups, and hydrophobic group alkenyl long chains are introduced into the starch molecules through esterification reaction to enhance the waterproof capability of the straw; on the other hand, the introduction of hydrophobic carbon chains on molecular structures such as epoxy linoleate, epoxy oleate and epoxy palmitate in the epoxidized soybean oil can reduce the sensitivity of the straw to moisture and further improve the waterproof performance of the starch-based straw.
The application has the beneficial effects that:
(1) The esterification reaction between starch and anhydride is promoted by the aid of epoxidized soybean oil, as shown in formula 1, and meanwhile, a hydrophobic group alkenyl long chain is introduced into starch molecules, so that the waterproofness of the straw is enhanced.
1 (1)
(2) The starch is plasticized by the hydrophobic plasticizer, epoxidized soybean oil, as in formula 2, to reduce the sensitivity of the straw to moisture.
2, 2
(3) The sensitivity of the straw to moisture can be reduced and the waterproof performance of the dodecenyl succinic acid starch-based straw can be further improved through the introduction of hydrophobic carbon chains on molecular structures such as epoxy linoleate, epoxy oleate, epoxy palmitate and the like in the epoxy soybean oil.
(4) The prepared straw has good waterproof performance, is environment-friendly and fully degradable, and can relieve the white pollution problem caused by petroleum-based plastic straws.
Detailed Description
For a better understanding of the present application, the technical solutions described in the present application will be further described with reference to examples, but the embodiments of the present application are not limited thereto.
Example 1
A preparation method of a waterproof dodecenyl succinic acid starch-based straw comprises the following steps:
(1) Mixing raw materials and auxiliary materials: 1000g of corn starch, 40g of dodecenyl succinic anhydride and 4.5g of sodium hydroxide dissolved in 50g of water are added into a high-speed stirrer and stirred for 6min at a rotation speed of 180 rpm; after being uniformly mixed, 230g of water and 30g of epoxidized soybean oil are added from an auxiliary valve, and the mixture is stirred for 8min at a rotating speed of 420 rpm; mixing, bagging, and standing;
(2) Starch-based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 42rpm, the rotating speed of the screw of the extruder set is 150rpm, and the temperature of a first area to a fourth area of a heating unit of the extruder set is 45 ℃,55 ℃,110 ℃ and 95 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 40 ℃ for drying for 3 hours, and obtaining the waterproof dodecenyl succinic acid starch-based straw after drying.
Example 2
A preparation method of a waterproof hexadecenyl succinic acid starch-based straw comprises the following steps:
(1) Mixing raw materials and auxiliary materials: 1000g of corn starch, 25g of hexadecenyl succinic anhydride and 6g of potassium hydroxide dissolved in 40g of water are added into a high-speed stirrer and stirred for 5min at a rotating speed of 300 rpm; after being uniformly mixed, 210g of water and 20g of epoxidized soybean oil are added from an auxiliary valve, and the mixture is stirred for 10min at a rotating speed of 360 rpm; mixing, bagging, and standing;
(2) Starch-based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 24rpm, the rotating speed of a screw of the extruder set is 60rpm, and the temperatures of a first area to a fourth area of a heating unit of the extruder set are 40 ℃,55 ℃,85 ℃ and 80 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 30 ℃ for drying for 6 hours, and obtaining the waterproof hexadecenyl succinic acid starch-based straw after drying.
Example 3
The preparation method of the waterproof starch-based straw comprises the following steps:
(1) Mixing raw materials and auxiliary materials: 1000g of tapioca starch, 85g of dodecenyl succinic anhydride and 4g of sodium hydroxide dissolved in 20g of water are added into a high-speed stirrer and stirred for 10min at a rotating speed of 150 rpm; after uniformly mixing, 330g of water and 35g of epoxidized soybean oil are added from an auxiliary valve, and stirred for 5min at a rotating speed of 600 rpm; mixing, bagging, and standing;
(2) Starch-based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 60rpm, the rotating speed of a screw of the extruder set is 240rpm, and the temperatures of a first area to a fourth area of a heating unit of the extruder set are 55 ℃,65 ℃,115 ℃ and 105 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 50 ℃ for drying for 2 hours, and obtaining the waterproof dodecenyl succinic acid starch-based straw after drying.
Comparative example 1
The procedure was the same as in example 1 except that dodecenyl succinic anhydride was not added as in example 1.
A method for preparing a starch-based straw, comprising the steps of:
(1) Mixing raw materials and auxiliary materials: 1000g of corn starch and 4.5g of sodium hydroxide dissolved in 50g of water are added into a high-speed stirrer and stirred for 6min at a rotation speed of 180 rpm; after being uniformly mixed, 260g of water and 30g of epoxidized soybean oil are added from an auxiliary valve, and the mixture is stirred for 8min at a rotating speed of 420 rpm; mixing, bagging, and standing;
(2) Starch-based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 42rpm, the rotating speed of the screw of the extruder set is 150rpm, and the temperature of a first area to a fourth area of a heating unit of the extruder set is 45 ℃,55 ℃,110 ℃ and 95 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 40 ℃ for drying for 3 hours, and obtaining the starch-based straw after drying.
Comparative example 2
The procedure was the same as in example 1 except that epoxidized soybean oil was not added as in example 1.
A method for preparing a starch-based straw, comprising the steps of:
(1) Mixing raw materials and auxiliary materials: mixing raw materials and auxiliary materials: 1000g of corn starch, 40g of dodecenyl succinic anhydride and 4.5g of sodium hydroxide dissolved in 50g of water are added into a high-speed stirrer and stirred for 6min at a rotation speed of 180 rpm; after being uniformly mixed, 230g of water is added from an auxiliary valve, and the mixture is stirred for 8min at a rotation speed of 420 rpm; mixing, bagging, and standing;
(2) Starch dodecenyl succinic acid based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 42rpm, the rotating speed of the screw of the extruder set is 150rpm, and the temperature of a first area to a fourth area of a heating unit of the extruder set is 45 ℃,55 ℃,110 ℃ and 95 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 40 ℃ for drying for 3 hours, and obtaining the starch-based straw after drying.
Comparative example 3
The procedure was the same as in example 1 except that dodecenyl succinic anhydride and epoxidized soybean oil were not added as in example 1.
A method for preparing a starch-based straw, comprising the steps of:
(1) Mixing raw materials and auxiliary materials: mixing raw materials and auxiliary materials: 1000g of corn starch and 4.5g of sodium hydroxide dissolved in 50g of water are added into a high-speed stirrer and stirred for 6min at a rotation speed of 180 rpm; after being uniformly mixed, 230g of water is added from an auxiliary valve, and the mixture is stirred for 8min at a rotation speed of 420 rpm; mixing, bagging, and standing;
(2) Starch-based straw extrusion construction: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, wherein the rotating speed of a feeding screw is 42rpm, the rotating speed of the screw of the extruder set is 150rpm, and the temperature of a first area to a fourth area of a heating unit of the extruder set is 45 ℃,55 ℃,110 ℃ and 95 ℃. Extruding the material through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device (with a fan), and cutting the cooled pipe blank through a cutting machine;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven at 40 ℃ for drying for 3 hours, and obtaining the starch-based straw after drying.
Examples of the effects
The suction pipe samples obtained in examples 1 to 3 and comparative examples 1 to 3 were subjected to measurement of water absorption:
the water absorption measurement method comprises the following steps: the starch-based straw was weighed (M1), then placed in 45℃water for 15min, the starch-based straw was removed and the surface was wiped clean with absorbent paper, and the weight M2 of the straw after immersion was recorded.
Table 1 water absorption of the pipettes prepared in example 1 and comparative examples 1-3
As can be seen from Table 1, the suction pipe prepared by plasticizing epoxidized soybean oil and esterifying and modifying dodecenyl succinic anhydride has a water absorption rate of only 16.7% (example 1) which is obviously lower than that of comparative examples 1-3, thus indicating that the suction pipe prepared by the method has better water resistance. When dodecenyl succinic anhydride was not added, the water absorption of the straw was significantly increased compared to example 1 (comparative example 1), indicating that the long chain dodecenyl chain of the hydrophobic group introduced by esterification modification can improve the water-proof ability of the straw. When epoxidized soybean oil was not added, the water absorption of the straw was also increased as compared to example 1 (comparative example 2), indicating that the hydrophobic carbon chain introduced by the hydrophobic plasticizer epoxidized soybean oil can improve the water-proofing ability of the straw. The water absorption of the straw was maximized when dodecenyl succinic anhydride and epoxidized soybean oil were not added (comparative example 3), indicating that the esterification modification and the plasticizing treatment of the hydrophobic plasticizer can effectively improve the water resistance of the straw. The straw prepared by the method has the characteristic of good waterproof performance.
Claims (8)
1. A waterproof starch-based straw is characterized by comprising the following raw materials, by taking 100g of starch as a reference, 2.5-8.5% of alkenyl succinic anhydride, 0.4-0.6% of strong base, 2-5% of epoxidized soybean oil and 25-35% of water.
2. The waterproof starch-based straw of claim 1, wherein the starch is corn starch.
3. The waterproof starch-based straw of claim 1, wherein the alkenyl succinic anhydride has an alkenyl chain C number of 12 or greater.
4. The waterproof starch-based straw of claim 1, wherein the alkenyl succinic anhydride is dodecenyl succinic anhydride.
5. The waterproof starch-based straw of claim 1, wherein the strong base is sodium hydroxide or/and potassium hydroxide.
6. A method of making a waterproof starch-based straw according to any one of claims 1-5, comprising the steps of:
(1) Mixing the raw materials: starch, alkenyl succinic anhydride and strong alkali dissolved in water are stirred and mixed uniformly at a low speed, and then water and epoxidized soybean oil are added for rapid stirring; mixing, bagging, and standing;
(2) Extrusion construction of starch-based straws: uniformly feeding the material obtained in the step (1) into a double-screw extruder set through a single-screw feeding system, setting extrusion parameters of an extruder, and extruding through a straw forming die head to form a pipe blank;
(3) And (3) slitting: cooling the pipe blank obtained in the step (2) through a conveying device with a fan, and cutting after cooling;
(4) And (3) drying: and (3) placing the cut straw in the step (3) in a drying oven, and drying to obtain the waterproof starch-based straw.
7. The method according to claim 6, wherein the low-speed stirring conditions in the step (1) are: the rotating speed is 150-300rpm, and the stirring time is 5-10min; the rapid stirring conditions are as follows: the rotation speed is 360-600rpm, and the stirring time is 5-10min.
8. The method of claim 6, wherein the extruder extrusion parameters in step (2) are: the rotating speed of the feeding screw is 24-60rpm; extruder set screw speed 60-240rpm, extruder set heating unit one zone to four zone temperature: 40-55deg.C, 55-65deg.C, 85-115 deg.C, and 80-105deg.C.
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| CN202310605780.1A CN116574313A (en) | 2023-05-26 | 2023-05-26 | Waterproof starch-based straw and preparation method thereof |
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| CN202310605780.1A CN116574313A (en) | 2023-05-26 | 2023-05-26 | Waterproof starch-based straw and preparation method thereof |
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| CN202310605780.1A Pending CN116574313A (en) | 2023-05-26 | 2023-05-26 | Waterproof starch-based straw and preparation method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142987A (en) * | 2020-10-15 | 2020-12-29 | 中国科学院长春应用化学研究所 | Modified starch, preparation method thereof, starch film and preparation method thereof |
| CN112898602A (en) * | 2021-01-14 | 2021-06-04 | 山东蔚来新材料有限公司 | Preparation method of edible straw and raw material mixing device |
| CN113502065A (en) * | 2021-08-11 | 2021-10-15 | 汕头市佳宏纸制品有限公司 | Environment-friendly paper rod and preparation method thereof |
| CN113715242A (en) * | 2021-11-01 | 2021-11-30 | 昌亚新材料科技有限公司 | Degradable package and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112142987A (en) * | 2020-10-15 | 2020-12-29 | 中国科学院长春应用化学研究所 | Modified starch, preparation method thereof, starch film and preparation method thereof |
| CN112898602A (en) * | 2021-01-14 | 2021-06-04 | 山东蔚来新材料有限公司 | Preparation method of edible straw and raw material mixing device |
| CN113502065A (en) * | 2021-08-11 | 2021-10-15 | 汕头市佳宏纸制品有限公司 | Environment-friendly paper rod and preparation method thereof |
| CN113715242A (en) * | 2021-11-01 | 2021-11-30 | 昌亚新材料科技有限公司 | Degradable package and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| YOUNG-SEON JEON等: "Studies of Starch Esterification: Reactions with Alkenyl succinates in Aqueous Slurry Systems", STARCH-STARKE, vol. 51, no. 2, 31 March 1999 (1999-03-31), pages 90 - 93 * |
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