CN112250911A - Method for preparing degradable plastic straw by using rice flour-amylose-wheat gluten - Google Patents
Method for preparing degradable plastic straw by using rice flour-amylose-wheat gluten Download PDFInfo
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Abstract
The invention relates to the field of degradable plastics and discloses a method for preparing a degradable plastic straw by using rice flour-amylose-wheat gluten. The preparation method comprises the following preparation processes: (1) mixing rice flour and amylose, refining and compounding, adding water and acetic acid, stirring and standing to obtain pretreated rice flour amylose; (2) mixing and extruding kneaded materials of wheat gluten and corn oil with pretreated rice flour-amylose starch to obtain a thin tube blank; (3) and continuously and sequentially immersing the thin tube blank into hot water with gradient temperature for solidification and curing, straightening, drying, cutting, sealing and packaging to obtain the degradation straw. The plastic straw obtained by the method is low in cost, healthy and environment-friendly, can be directly eaten, can be quickly degraded after being discarded, can be recycled as fertilizer and feed, is excellent in short-term water resistance, has good bending property and elasticity, and provides an effective technical support for solving the problem that the plastic straw is not degradable.
Description
Technical Field
The invention relates to the field of degradable plastics and discloses a method for preparing a degradable plastic straw by using rice flour-amylose-wheat gluten.
Background
The biodegradable plastic is an energy-saving environment-friendly new material, and with the vigorous promotion of environment-friendly products in China, the utilization of regenerated biomass energy and the popularization and application of the biodegradable plastic are encouraged, and the development and application of the biodegradable plastic are generally concerned. The biodegradable plastic mainly contains active groups such as hydroxyl, ester, carboxyl and the like which are easily decomposed by microorganisms, and when the biodegradable plastic is placed in a natural environment under certain temperature and humidity conditions, the active groups are easily decomposed into water and carbon dioxide under the action of the microorganisms and the like, so that the biodegradable plastic returns to the nature. Therefore, biodegradable plastics are one of the effective ways to solve the environmental pollution caused by plastic wastes, and become the development direction of the plastic industry at present.
With the vigorous advance of plastic pollution treatment and the demand for ecological environmental protection and health in China, biodegradable plastics in the catering industry are used as key points for development, and straws for various cold beverages, hot beverages and breakfast are gradually replaced by biodegradable plastic straws from ordinary plastic straws, so that the main trend is to replace the ordinary plastic straws with the biodegradable plastic straws. At present, the biodegradable plastics commonly used for plastic straws mainly comprise polylactic acid (PLA), polybutylene succinate (PBS), Polycaprolactone (PCL), polybutylene adipate (PBAT) and the like. However, the bioplastics are high in cost, and a large amount of plasticizing auxiliaries are required to be added in the processing process, so that the problems of precipitation and the like exist, and the bioplastics have strict requirements on materials when being applied to a straw which is directly contacted with a human body; in addition, the straw made of the biological plastics has a relatively long degradation period after being discarded, and is composted in a limited environment, so that the degradation period is long. Therefore, it is generally regarded important to research biodegradable plastics capable of being rapidly and effectively degraded and to use the biodegradable plastics in catering industry articles such as plastic straws and the like.
Among the bioplastics, starch-based plastics have been successfully used for industrial production and application as an important class of bio-based materials. The starch-based plastic is a plastic product which is prepared by mixing starch serving as a main raw material with other polymers after modification and plasticization, and has biodegradability. Meanwhile, starch is an edible raw material, which can be used as a raw material for preparing straws. However, starch contains a large number of hydroxyl groups on molecular chains, and strong hydrogen bonds between molecular chains, so that the starch has no thermoplasticity, is difficult to mold and process, has poor water resistance, and has poor compatibility with base resin due to strong polarity, and the completion of the thermoplasticity treatment of starch and the application of the starch and plastic are important research subjects.
Chinese patent application No. 201910426369.1 discloses an edible environment-friendly straw, which comprises the following components in parts by weight: 25-35 parts of rice starch; 15-25 parts of wheat bran; 5-15 parts of cassava; 10-30 parts of agar; 10-20 parts of trehalose.
Chinese patent application No. 201711322182.4 discloses an environment-friendly straw, which comprises the following components in parts by weight: 15-30 parts of corn starch, 30-40 parts of vegetable fiber, 10-20 parts of straw fiber, 6-10 parts of lemon juice, 0.5-2 parts of sodium sulfite, 1-5 parts of borax, 20-50 parts of water and 0.5-2 parts of defoaming agent.
According to the above, in the existing scheme, when the method is used for the material of the biodegradable plastic straw, the cost of common bioplastic is high, more additives are required to be added in the processing process, the problems of precipitation and the like exist, the plasticizing treatment of starch-based bioplastic needs more plasticizers such as glycerin and the like, the water resistance is poor, the additives are inedible, and the starch straw is difficult to prepare in a plastic thermoplastic processing mode.
Disclosure of Invention
The cost of the bioplastic which is widely applied to the conventional biodegradable plastic straw is high, more additives are required to be added in the processing process, the problems of precipitation and the like exist, more plasticizers are required for plasticizing treatment of the starch-based bioplastic, the water resistance is poor, the additives cannot be eaten, the starch straw is difficult to prepare in a thermoplastic processing mode of the plastic, and the application of the starch-based plastic in catering industry articles such as the plastic straw is restricted.
The invention solves the problems through the following technical scheme:
a method for preparing a degradable plastic straw by using rice flour-amylose-wheat gluten comprises the following specific steps:
(1) firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank;
(3) and (3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain the degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten.
The starch is a natural polymer with the yield second to that of cellulose on the earth, has rich sources, is renewable and low in price, and can be used for producing starch-based plastics through modification and plasticization. The starch-based degradable plastic as a blend of modified starch, a resin matrix and the like can be completely biodegraded, and has excellent environmental protection and economy. In the present invention, amylose is preferred as a raw material in the production of starch-based plastic straws because amylose is a polysaccharide chain in which D-glucosyl groups are bonded by a- (1,4) glycosidic bonds, has polarity, i.e., directionality, has a 1 '-end (reducing end) at one end and a 4' -end (non-reducing end) at the other end, has swelling resistance, good film-forming properties and strength, has properties similar to fibers, and has good transparency, flexibility, tensile strength and water insolubility, thus being an excellent raw material for starch-based plastic straws. Preferably, the amylose in step (1) is pea starch. As a further preference of the present invention, the amylose is selected from the group consisting of pea starch produced in Gansu province (offered by Gansu Star starch food Co., Ltd.) and pea starch produced in Shandong tobacco stage (offered by tobacco stage double-tower food Co., Ltd.).
According to the invention, after the rice flour and the amylose are mixed, a refiner is used for refining and compounding to obtain a refined mixture, so that the starch and the rice flour can be conveniently treated in the subsequent preparation process. Preferably, the refiner in the step (1) adopts a vortex airflow refiner, and the air volume is 1000-2000 m3And/h, the rotating speed of the grading impeller is 500-1200 r/min, and the grain diameter of the refined rice flour and the amylose is less than 10 mu m.
Preferably, the refined mixture in the step (1) comprises 1-2 parts by weight of rice flour and 3-6 parts by weight of amylose.
The refined mixture of the rice flour and the amylose is added with water and acetic acid, the adding proportion of the water and the acetic acid is controlled, the refined mixture fully adsorbs the water and the acetic acid through placement treatment, and the rice flour and the amylose have better flexibility and elasticity through the treatment of the acetic acid, so that the subsequent processing of the starch plastic product can be ensured to keep good mechanical property. Preferably, the pre-treated rice flour amylose in the step (1) comprises 100 parts by weight of refined mixture; the standing time is 1-2 h.
In the invention, the wheat gluten and the corn oil are kneaded and further mixed with the pretreated amylose to be extruded and molded. Gluten powder is also called active gluten powder and wheat gluten protein, is natural protein extracted from wheat flour, mainly comprises wheat gluten with small molecular weight, spherical shape and good extensibility and wheat gluten with large molecular weight, fibrous shape and strong elasticity, has viscosity, elasticity, extensibility and film forming property, can effectively improve water resistance by kneading with corn oil, can solidify and mature rice flour-amylose in hot water into a straw with flexibility and elasticity by utilizing good elasticity and flexibility of the straw, simultaneously has good water resistance, cannot absorb water for softening in a short time, and can improve the service durability of the starch-based plastic straw.
Preferably, the extrusion in the step (2) is performed at normal temperature by using a downward die head of the extruder, the die head is provided with a row of holes with the diameter of 3-5 mm, and inner cores are arranged in the holes.
In the present invention, the raw material ratio of the kneaded material in the step (2) is preferably 100 parts by weight of wheat gluten and 10 to 20 parts by weight of corn oil.
Preferably, the raw material ratio of the thin tube blank in the step (2) is 1-2 parts by weight of kneaded material and 3-6 parts by weight of pretreated rice flour-amylose.
The invention continuously and sequentially immerses the thin tube blanks of the plastic suction tube which is extruded into hot water with gradient temperature arrangement, and the temperature of the hot water in which the thin tube blanks are immersed is sequentially increased, so that the thin tube blanks can be gradually solidified and cured, and the influence on the product quality caused by the deformation of the inner wall of the thin tube blanks due to the rapid temperature rise is effectively prevented. Preferably, the temperature of the hot water in the step (3) is set to be stepped, and the temperature of the hot water for sequentially immersing the thin tube blanks is 60-65 ℃, 70-75 ℃, 80-85 ℃ and 95-100 ℃.
The degradation straw prepared by the method has good water resistance, bending property and elasticity, and the raw materials are edible materials, so that the degradation straw is healthy, environment-friendly, edible and rapidly degradable. Through the test, the prepared degradation straw has no fracture when being subjected to a 90-degree bending test, and the surface is wiped smoothly without stickiness after being soaked in hot water at 60 ℃ for 15 min.
The invention provides a method for preparing a degradation straw by using rice flour-pea starch-wheat gluten, which comprises the steps of mixing rice flour with amylose, refining and compounding the mixture by a refiner, adding water and acetic acid, uniformly stirring, and standing to enable the water and the acetic acid to be fully adsorbed to obtain pretreated rice flour amylose; fully kneading wheat gluten and corn oil, then extruding and molding the pretreated rice flour-amylose and wheat gluten at normal temperature by using an extruder, and extruding into a thin tube blank; and continuously and sequentially immersing the thin tube blank into hot water with gradient temperature, gradually solidifying and curing the extruded hollow thin tube blank by the hot water, further straightening, drying, cutting, sealing and packaging.
The invention provides a method for preparing a degradable plastic straw by using rice flour-amylose-wheat gluten, which has the outstanding characteristics and excellent effects compared with the prior art:
1. provides a method for preparing a starch-based degradable plastic straw by using rice flour, amylose and wheat gluten as raw materials.
2. The plastic straw obtained by pretreating the rice flour and the amylose and then mixing the rice flour and the water-resistant wheat gluten for extrusion molding is low in cost, the used raw materials are edible materials, the plastic straw is healthy and environment-friendly, and meanwhile, the corn oil-treated wheat gluten has excellent short-term water resistance and has good bending property and elasticity.
3. The degradable plastic straw prepared by the invention can be directly eaten, can be rapidly degraded after being discarded, can also be used as fertilizer and feed to be recycled, has a good application prospect, and provides an effective technical support for solving the problem of non-degradability of the plastic straw.
Drawings
FIG. 1 shows a degradation straw prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; the refiner adopts a vortex airflow refiner with the air quantity of 1600m3The rotation speed of a grading impeller is 900r/min, and the average grain diameter of the refined rice flour and the refined amylose is 7 mu m; the refined mixture comprises 1.6 parts by weight of rice flour and 4.6 parts by weight of amylose; pretreated rice flour noodlesThe raw material proportion of the chain starch is that, calculated by weight portion, 100 weight portions of refined mixture, 136 weight portions of water and 4.2 weight portions of acetic acid are calculated; the standing time is 1.5 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 4mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 16 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 1.6 parts of kneaded material and 4.4 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 60 ℃, 70 ℃, 80 ℃ and 95 ℃.
The flexibility and water resistance of the degradable plastic straw prepared by the method of example 1 are shown in table 1, and the degradable plastic straw prepared by the method of example 1 is shown in fig. 1, is semitransparent and has good bending property.
Example 2
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; the refiner adopts a vortex air flow refiner with the air quantity of 1200m3The rotation speed of a grading impeller is 700r/min, and the average grain diameter of the refined rice flour and the refined amylose is 5 mu m; the refined mixture comprises, by weight, 1.2 parts of rice flour and 5.5 parts of amylose; preparation ofThe processed rice flour amylose comprises the following raw materials, by weight, 100 parts of refined mixture, 130 parts of water and 3.5 parts of acetic acid; the standing time is 1 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 35mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 12 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 1.2 parts of kneaded material and 5 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 65 ℃, 75 ℃, 85 ℃ and 100 ℃.
The flexibility and water resistance of the degradable plastic straw obtained by the method of example 2 are shown in Table 1.
Example 3
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; (ii) a The refiner adopts a vortex airflow refiner with the air quantity of 1800m3The rotation speed of a grading impeller is 1000r/min, and the average grain diameter of the refined rice flour and the refined amylose is 8 mu m; the refined mixture comprises 1.8 parts by weight of rice flour and 4 parts by weight of amylose; the pretreated rice flour amylose comprises the following raw materials in parts by weight,100 parts of refined mixture, 140 parts of water and 4.5 parts of acetic acid; the standing time is 2 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 5mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 18 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 1.8 parts of kneaded material and 4 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 60 ℃, 70 ℃, 80 ℃ and 100 ℃.
The flexibility and water resistance of the degradable plastic straw obtained by the method of example 3 are shown in Table 1.
Example 4
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; the refiner adopts a vortex air flow refiner with the air quantity of 1000m3The rotation speed of a grading impeller is 500r/min, and the average grain diameter of the refined rice flour and the refined amylose is 4 mu m; the refined mixture comprises the following raw materials, by weight, 1 part of rice flour and 6 parts of amylose; the pretreated rice flour amylose comprises the following raw materials, by weight, 100 parts of refined mixture, 120 parts of water and 3 parts of acetic acid; is placedThe time is 1 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 3mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 10 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 1 part of kneaded material and 6 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 60 ℃, 70 ℃, 80 ℃ and 95 ℃.
The flexibility and water resistance of the degradable plastic straw obtained by the method of example 4 are shown in Table 1.
Example 5
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; the refiner adopts a vortex air flow refiner with the air quantity of 2000m3The rotation speed of a grading impeller is 1200r/min, and the average grain diameter of the refined rice flour and the refined amylose is 9 mu m; the refined mixture comprises 2 parts by weight of rice flour and 3 parts by weight of amylose; the pretreated rice flour amylose comprises the following raw materials, by weight, 100 parts of refined mixture, 150 parts of water and 5 parts of acetic acid; the standing time is 2 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 5mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 20 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 2 parts of kneaded material and 3 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 65 ℃, 75 ℃, 85 ℃ and 95 ℃.
The flexibility and water resistance of the degradable plastic straw obtained by the method of example 5 are shown in Table 1.
Example 6
(1) Firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose; amylose is pea starch provided by Gansu Star starch food Co.Ltd; the refiner adopts a vortex air flow refiner with the air quantity of 1500m3The rotation speed of a grading impeller is 850r/min, and the average grain diameter of the refined rice flour and the refined amylose is 8 mu m; the refined mixture comprises 1.5 parts by weight of rice flour and 4.5 parts by weight of amylose; the pretreated rice flour amylose comprises the following raw materials, by weight, 100 parts of refined mixture, 135 parts of water and 4 parts of acetic acid; the standing time is 1.5 h;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank; the extrusion adopts an extruder with a downward die head, the die head is distributed with a row of holes with the diameter of 4mm, inner cores are arranged in the holes, and the extrusion molding process is carried out at normal temperature; the kneaded material comprises 100 parts by weight of wheat gluten and 15 parts by weight of corn oil; the raw material proportion of the thin tube blank is, by weight, 1.5 parts of kneaded material and 4.5 parts of pretreated rice flour-amylose;
(3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain a degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten; the temperature of the hot water is set to be in a step shape, and the temperature of the hot water in which the thin tube blank is sequentially immersed is 60 ℃, 70 ℃, 80 ℃ and 100 ℃.
The flexibility and water resistance of the degradable plastic straw obtained by the method of example 6 are shown in Table 1.
Comparative example 1
Comparative example 1 without corn oil-treated wheat gluten and under the same preparation conditions as in example 6, a degradable plastic straw was prepared, the flexibility and water resistance of which are shown in Table 1.
The performance index testing method comprises the following steps:
flexibility: the degradation straw obtained in the examples of the present invention and comparative example 1 was bent at 90 degrees and tested to determine the flexibility of the straw by breaking or not.
Water resistance: the degraded drinking straw obtained in the example of the present invention and the comparative example 1 was soaked in water at 60 ℃ for 15min, and then the surface of the straw was wiped to measure the water resistance of the straw by using the non-adhesive substance on the surface of the straw.
As can be seen from table 1: the degradation straw prepared by the embodiment of the invention has good flexibility and bending resistance, does not have a dissolved substance after being soaked in hot water for 15min, and meets the use requirement of the straw. Comparative example 1 since corn oil-treated wheat gluten was not added, the resulting degraded drinking straw was poor in bendability, easy to break, and poor in water resistance, and the straw was sticky after being immersed in water.
Table 1:
Claims (10)
1. a method for preparing a degradable plastic straw by using rice flour-amylose-wheat gluten is characterized by comprising the following specific steps:
(1) firstly, mixing rice flour and amylose, then carrying out thinning compounding by using a thinning machine, then adding water and acetic acid into the obtained thinned mixture, uniformly stirring, and finally, placing for treatment to ensure that the water and the acetic acid are fully adsorbed to obtain pretreated rice flour amylose;
(2) fully kneading wheat gluten and corn oil, mixing the kneaded material with the pretreated rice flour-amylose starch obtained in the step (1), and performing extrusion forming by using an extruder to obtain a thin tube blank;
(3) and (3) continuously and sequentially immersing the thin tube blank obtained in the step (2) into hot water, gradually solidifying and curing the extruded thin tube blank of the hollow strip by the hot water, straightening, drying, cutting, sealing and packaging to obtain the degradable straw, so that the degradable plastic straw is prepared by using the rice flour-amylose-wheat gluten.
2. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the amylose in the step (1) is one of pea starch.
3. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the refiner in the step (1) adopts a vortex airflow refiner, and the air volume is 1000-2000 m3And/h, the rotating speed of the grading impeller is 500-1200 r/min, and the grain diameter of the refined rice flour and the amylose is less than 10 mu m.
4. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the refined mixture in the step (1) comprises, by weight, 1-2 parts of rice flour and 3-6 parts of amylose.
5. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the pretreated rice flour amylose in the step (1) comprises the following raw materials, by weight, 100 parts of refined mixture, 120-150 parts of water and 3-5 parts of acetic acid.
6. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the standing time in the step (1) is 1-2 h.
7. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: and (2) extruding the material by using an extruder with a downward die head, wherein the die head is provided with a row of holes with the diameter of 3-5 mm, inner cores are arranged in the holes, and the extrusion forming process is carried out at normal temperature.
8. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the kneaded material in the step (2) comprises 100 parts by weight of wheat gluten and 10-20 parts by weight of corn oil.
9. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: the raw material proportion of the thin tube blank in the step (2) is 1-2 parts by weight of kneaded material and 3-6 parts by weight of pretreated rice flour-amylose.
10. The method for preparing the degradable plastic straw by using the rice flour-amylose-wheat gluten as the claim 1, which is characterized in that: and (3) setting the temperature of the hot water to be stepped, wherein the temperature of the hot water for sequentially immersing the thin tube blank is 60-65 ℃, 70-75 ℃, 80-85 ℃ and 95-100 ℃.
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| CN202011137037.0A CN112250911A (en) | 2020-10-22 | 2020-10-22 | Method for preparing degradable plastic straw by using rice flour-amylose-wheat gluten |
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| CN202011137037.0A CN112250911A (en) | 2020-10-22 | 2020-10-22 | Method for preparing degradable plastic straw by using rice flour-amylose-wheat gluten |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876746A (en) * | 2021-01-26 | 2021-06-01 | 沈阳化工大学 | Preparation method of degradable food and beverage straw |
| CN113637334A (en) * | 2021-07-13 | 2021-11-12 | 安徽壳氏环保科技有限公司 | Novel environment-friendly degradable beverage straw |
-
2020
- 2020-10-22 CN CN202011137037.0A patent/CN112250911A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876746A (en) * | 2021-01-26 | 2021-06-01 | 沈阳化工大学 | Preparation method of degradable food and beverage straw |
| CN113637334A (en) * | 2021-07-13 | 2021-11-12 | 安徽壳氏环保科技有限公司 | Novel environment-friendly degradable beverage straw |
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